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Analysis of Nana Shimura's Quirks and Related Quirks

Nana Shimura, a pivotal character in My Hero Academia, possessed two Quirks: Float and One For All. Below is an in-depth analysis of these Quirks, their applications, and their connections to other characters, including Tenko Shimura's original Quirk and its implications.

1. Float

Description: Float is an Emitter-type Quirk that allows the user to levitate and suspend themselves in mid-air. Its core ability is mobility-based, granting the user the power to defy gravity and remain airborne. While it is not explicitly stated whether Nana could maneuver freely while levitating, her usage suggests a degree of control, especially when combined with One For All.

Usage by Nana:

Nana used Float to navigate the battlefield alongside Gran Torino, who was renowned for his speed with his Jet Quirk. This indicates that Float, while not inherently a speed-based Quirk, provided sufficient mobility to keep pace with high-speed heroes.

When paired with One For All, Float's capabilities were amplified, allowing Nana to engage in dynamic aerial combat and swiftly respond to threats. For example, she could fly into danger to confront villains, showcasing its utility in close-combat scenarios.

Weaknesses:

Float's primary limitation is its lack of offensive or defensive capabilities. It is purely a mobility Quirk, requiring the user to rely on other abilities (like One For All) or physical prowess for combat effectiveness.

It is unclear if Nana could adjust her altitude or direction with precision, which could limit its tactical applications in complex environments.

Inheritance and Evolution:

Izuku Midoriya: Izuku inherited Float as part of One For All's vestige system, unlocking it during the Paranormal Liberation War. With One For All's stockpiled energy, Izuku's Float was significantly enhanced, allowing him to fly at high speeds and perform feats like dragging Tomura Shigaraki into the air while saving allies with Blackwhip. Izuku further combined Float with other Quirks like Fa Jin and Air Force to achieve greater speed and maneuverability, demonstrating its versatility when amplified.

Tomura Shigaraki: Float was forcibly transferred to Tomura during his final battle with Izuku, but it was destroyed within his consciousness by Nana to weaken his soul. This transfer highlights Float's significance as a symbolic and tactical Quirk within the One For All legacy.

Comparison to Similar Quirks:

Air Walk: Like Float, Air Walk allows levitation, but it may offer more precise control, as seen with Lady Nagant's usage. Float, however, benefits from One For All's enhancement, making it more powerful in terms of speed and range.

Christopher Skyline's Flight: When combined with Fa Jin and Air Force, Izuku's Float mimics Flight's high-speed aerial capabilities, though it lacks the same level of innate propulsion.

2. One For All

Description: One For All is a Transferable Quirk that stockpiles raw power, granting the user superhuman strength, speed, agility, and durability. It also carries the vestiges and Quirks of its previous users, which later users like Izuku can access.

Usage by Nana:

Nana's mastery of One For All allowed her to dispatch large groups of villains with ease, as seen when she saved a young Toshinori Yagi. Her physical strength was sufficient to handle One For All's immense power without her body breaking down, a testament to her trained physique.

Combined with Float, One For All enabled Nana to engage in aerial combat, making her a versatile and formidable hero. Her ability to take down a villain twice her size highlights her combat proficiency.

Weaknesses:

One For All's raw power requires a strong body to wield, as weaker users risk severe injury or death. Nana's toned muscles mitigated this risk, but it remained a limitation for potential successors like Toshinori, who was initially Quirkless.

Against All For One, Nana's One For All was insufficient, indicating that even with her strength, she could not match the villain's overwhelming power and Quirk arsenal.

Inheritance and Evolution:

Nana passed One For All to Toshinori Yagi (All Might), who became the Symbol of Peace. Her mentorship shaped his philosophy of heroism, particularly the importance of smiling to inspire hope.

Izuku Midoriya, the ninth user, further evolved One For All by accessing the Quirks of previous users, including Float. This made One For All a multifaceted Quirk, combining multiple abilities for enhanced combat effectiveness.

Strategic Importance:

One For All's stockpiling nature means it grows stronger with each user, making Nana's contribution to its legacy significant. Her use of Float alongside One For All set a precedent for combining mobility and raw power, a strategy Izuku later refined.

3. Tenko Shimura's Original Quirk

Description: Tenko Shimura, Nana's grandson, originally possessed a Quirk that allowed him to create "flying circles" or floating platforms to propel himself through the air. This Quirk was stolen by All For One as an infant and merged with other Quirks to create a powerful repulsion-based Quirk, which Tomura later used for flight.

Analysis:

Tenko's Quirk bears a striking resemblance to Nana's Float, suggesting a genetic or thematic connection. Both Quirks focus on aerial mobility, with Tenko's potentially offering more dynamic propulsion through the creation of platforms.

The "flying circles" concept implies a more active form of flight compared to Float's static levitation. It may have allowed Tenko to generate specific points of propulsion, potentially offering greater control or offensive capabilities (e.g., launching platforms at enemies).

Impact of Theft:

All For One's theft of Tenko's Quirk and replacement with Decay shaped his transformation into Tomura Shigaraki, a villain driven by destruction. This act severed Tenko's connection to his grandmother's heroic legacy and redirected his potential toward villainy.

The merged repulsion Quirk, used by Tomura, retained flight capabilities, indicating that Tenko's original Quirk was a core component of this new ability. This suggests that Tenko's Quirk was inherently powerful, as it contributed to a Quirk capable of rivaling One For All.

Symbolism:

The similarity between Nana's Float and Tenko's flying circles underscores their familial bond and the tragic divergence of their paths. Nana's Float was used for heroism, while Tenko's stolen Quirk became a tool for destruction, reflecting the consequences of All For One's manipulation.

4. Comparative Analysis

Mobility Focus: Both Float and Tenko's original Quirk emphasize aerial mobility, a rare and valuable trait in My Hero Academia. Nana's Float is simpler, focusing on levitation, while Tenko's Quirk may have offered more versatility through platform creation.

Enhancement with One For All: Float's effectiveness was greatly amplified by One For All, allowing Nana and Izuku to achieve high-speed flight and dynamic combat maneuvers. Tenko's Quirk, if paired with a similar power boost, could have been equally formidable, but its theft prevented this potential.

Combat Utility: Float relies on the user's physical strength or additional Quirks for combat, while Tenko's Quirk might have had inherent offensive applications (e.g., using platforms as projectiles). However, without direct evidence of Tenko's Quirk in action, this remains speculative.

Narrative Role: Float symbolizes Nana's heroism and her legacy within One For All, while Tenko's stolen Quirk represents lost potential and the tragedy of his manipulation by All For One. Both Quirks highlight the theme of choice—Nana chose to use her Quirk for good, while Tenko was denied that agency.

5. Strategic and Thematic Implications

Nana's Legacy: Nana's use of Float and One For All established her as a versatile hero capable of both inspiring hope and engaging in high-stakes combat. Her decision to pass One For All to Toshinori, despite his Quirkless nature, reflects her belief in potential over innate ability, a philosophy that resonates with Izuku.

Tenko's Tragedy: The theft of Tenko's Quirk and its replacement with Decay is a pivotal moment in the story, illustrating All For One's cruelty and the ripple effects of Nana's choices. Her decision to place Kotaro in foster care, while well-intentioned, indirectly led to Tenko's vulnerability, amplifying the tragedy of her grandson's fall.

Izuku's Evolution: Izuku's mastery of Float, combined with other One For All Quirks, represents the culmination of Nana's legacy. His ability to use Float to save allies and confront Tomura mirrors Nana's heroic ideals, while his resolve to save Tenko's heart reflects her empathy and regret.

Nana Shimura: The Tragic Catalyst Who Single-Handedly Set the Stage for All For One and Tomura's Reign of Terror Nana Shimura is not just a hero in My Hero Academia — she is the unintentional architect of its greatest villains and the collapse of hero society. Every major disaster, from the creation of Tomura Shigaraki to the near-victory of All For One, stems from a chain of her decisions driven by fear, grief, and misguided heroism. But she didn't act alone; the other early One For All (OFA) users — Kudo, Bruce, En, Daigoro, and Hikage — compounded her mistakes through their own failures, shortsightedness, and inability to break the cycle of violence. This analysis breaks down every single way Nana (and her fellow vestiges) doomed the world, step by step, incorporating their synopses and the series' "stupid decisions" tropes that allowed AFO to exploit those flaws.

The Foundational Flaw: Nana's Abandonment of Kotaro — The Butterfly Effect That Birthed Tomura

Nana's husband is killed by a villain (likely AFO or his agents), leaving her with young Kotaro (age 5–7).

You'd expect: Nana to protect her son by going underground, relocating the family, or seeking help from allies like Gran Torino. Heroes like the Wild Wild Pussycats or Enji Todoroki (pre-abuse) managed families despite threats.

Instead: She completely abandons Kotaro to an orphanage, alters records to erase ties, and forbids All Might/Gran Torino from ever checking on him. She leaves a vague letter: "Mommy has to fight bad guys, so I can't come home. I love you."

Result: Kotaro grows up traumatized, viewing heroes as selfish abandoners who prioritize strangers over family. This resentment defines him, leading him to:

Marry Nao and have Hana and Tenko.

Enforce a "no heroes" rule, abusing Tenko for any interest in heroism.

Befriend AFO (who exploits his hatred), father Tenko as a vessel, and allow AFO to swap Tenko's Quirk for Decay.

Trope tie-in: "You'd expect Kotaro to seek therapy or question heroes rationally." Instead, he internalizes Nana's abandonment, passing the trauma to Tenko — who snaps, kills his family, and becomes Tomura. Nana's "protection" directly creates the series' main villain.

How Kudo's Resistance Movement Enabled AFO's Long Game

Kudo (2nd user) forms a resistance against AFO's rising empire, recruiting Bruce (3rd user) and others.

You'd expect: Kudo to prioritize stealth, avoid direct confrontations until ready, and build a network that could protect families like Nana's.

Instead: He raids AFO's base to kill Yoichi (AFO's brother), but spares him and rescues him instead — kickstarting OFA's growth but alerting AFO to their existence.

Result: AFO massacres Kudo's entire resistance, kills Kudo, and hunts down every woman/child in his bloodline. This forces Nana (7th user) into her abandonment mindset, as she sees the cost of fighting AFO head-on.

Compounding mistake: Kudo passes OFA to Bruce, who flees overseas but gets tracked and killed by AFO. Bruce's "distraction" tactic (drawing AFO away from Hikage) fails spectacularly, as AFO just kills him and continues hunting.

Trope tie-in: "You'd expect Kudo to verify Yoichi's loyalty before rescue." Instead, this act of mercy gives AFO a personal grudge, leading him to target Nana's family decades later. Kudo's "heroic" impulse dooms generations.

Bruce's Failed Distraction and the Chain of Weak Successors

Bruce (3rd user) receives OFA from Kudo and flees with survivors to distract AFO from Hikage (4th user).

You'd expect: Bruce to go fully underground, coordinate with Hikage for a joint strike, or destroy any records that could lead AFO to future users.

Instead: He leads a high-profile escape overseas, making himself an easy target. AFO impales him and kills him, but not before Bruce tests OFA transfer mechanics (DNA + will).

Result: AFO learns more about OFA's mechanics from these failures, allowing him to plan long-term (e.g., grooming Tomura). Bruce's death leaves Hikage isolated, who wastes 18 years hiding instead of fighting.

Trope tie-in: "You'd expect Bruce to fake his death or split the group." Instead, his "noble sacrifice" achieves nothing, as AFO just moves on to the next user. This pattern of "run and hide" from early users lets AFO consolidate power unchecked.

En's Quick Death and the Legacy of Inadequate Preparation

En (6th user) receives OFA from Daigoro (5th user) after Daigoro's death.

You'd expect: En to train rigorously, ally with Nana early, and use Smokescreen for guerrilla tactics against AFO's empire.

Instead: He fights AFO head-on, gets cut in half, and barely passes OFA to Nana via hair ingestion.

Result: Nana inherits a barely-powered OFA, forcing her to train All Might from scratch. En's rushed transfer (no time for advice) leaves Nana without key knowledge, contributing to her fear-driven abandonment of Kotaro.

Trope tie-in: "You'd expect En to evade and pass OFA secretly." Instead, his direct confrontation echoes Kudo's raid — heroic but stupid, giving AFO more intel on OFA's transfer method.

Daigoro's Reckless Fight and the Pattern of Sacrificial Deaths

Daigoro (5th user, "Lariat") receives OFA from Hikage.

You'd expect: Daigoro to learn from Hikage's isolation and build alliances, avoiding solo fights with AFO.

Instead: He confronts AFO directly, gets crushed under rubble, and passes OFA to En via blood.

Result: Another quick death, weakening OFA's chain. Daigoro's "fight hard" mentality influences Nana's sacrificial stand against AFO, where she dies smiling but leaves All Might traumatized and the world vulnerable.

Trope tie-in: "You'd expect Daigoro to retreat like Bruce." Instead, his bravado mirrors the series' trope of heroes charging in without backup, allowing AFO to pick off users one by one.

Hikage's 18-Year Hiding and the Wasted Time That Empowered AFO

Hikage (4th user) receives OFA from Bruce and hides in the woods for 18 years to "cultivate" it.

You'd expect: Hikage to use Danger Sense for hit-and-run attacks on AFO's empire, recruit allies, or at least monitor threats.

Instead: He completely isolates, training alone until OFA + Danger Sense ages him prematurely (dies at 40 of "old age"). Passes OFA to Daigoro on his deathbed.

Result: 18 years of inaction let AFO's power peak unchecked, killing Nana's husband and forcing her abandonment. Hikage's "hide and grow" strategy fails spectacularly, as OFA isn't strong enough yet when passed on.

Trope tie-in: "You'd expect Hikage to scout with Danger Sense." Instead, his hermit life echoes the trope of "isolated training montages" that achieve nothing, giving AFO free reign to expand.

The Collective Failure: The Early Users' "Pass and Die" Cycle

All early users (Kudo through Hikage) treat OFA like a hot potato: fight AFO, lose, pass it on while dying.

You'd expect: Coordinated multi-user attacks, long-term planning, or destroying AFO's network before direct fights.

Instead: Isolated deaths allow AFO to learn OFA's mechanics (transfer via DNA/will, resistance to theft). This knowledge lets AFO create Decay (modified Overhaul) for Tenko and groom Tomura as the perfect vessel.

Result: Nana inherits a cursed legacy, dying in her prime and leaving All Might to fight alone for 40 years.

Nana's Direct Role in All Might's Flaws

Nana mentors All Might but dies early, leaving him with "smile through pain" advice but no family support network.

You'd expect: Nana to warn All Might about her family, so he could protect Kotaro.

Instead: Her oath of secrecy prevents All Might from ever knowing about Kotaro until too late.

Result: All Might's lone-wolf style (no family, no backups) mirrors Nana's isolation, delaying AFO's defeat and allowing Tomura to grow.

Vestige Mistakes: The Afterlife Failures That Nearly Sealed the Doom

In the vestige world, the early users (especially Kudo and Bruce) initially reject Izuku for wanting to save Tomura.

You'd expect: Immediate unity against AFO, using their knowledge to guide Izuku.

Instead: Kudo/ Bruce turn their backs, delaying Izuku's full access to Quirks. Hikage sacrifices himself first, losing Danger Sense early.

Result: Izuku nearly dies multiple times; the internal debate wastes precious time, allowing Tomura to steal Quirks and nearly win.

The Ultimate Irony: Nana's "Heroic Sacrifice" Enables AFO's Greatest Victory

Nana dies fighting AFO, passing OFA to All Might with a smile.

You'd expect: A living Nana to defeat AFO or protect her family.

Instead: Her death gives AFO her hand (as Tomura's mask) and cements Kotaro's hatred. AFO uses this to groom Tomura, turning Nana's legacy against itself.

Trope tie-in: "You'd expect Nana to retreat like Hikage." Instead, her charge-in trope (like All Might vs. AFO) achieves nothing but her death.

Broader Dooms: How Nana's Legacy Created Systemic Failures

Hero society's "smile and save" ideal (Nana's words) leads to tropes like All Might ignoring Tomura's cries for help as a child.

Abandonment trope repeats: Endeavor abuses Shoto (mirroring Kotaro's abuse), creating Dabi.

AFO exploits the "pass and die" chain: Each user's death gives him more time to build his empire, steal Quirks, and create Nomu.

Final War: The users' sacrifices (Kudo exploding, En piercing, etc.) only work because Izuku rejects Nana's "kill him" advice — her final mistake nearly dooms the world again.

How Nana Shimura Single-Handedly Doomed the Entire MHA World: A Complete Breakdown

Nana Shimura is the single biggest butterfly-effect disaster in the entire series. Every single major catastrophe in My Hero Academia — Tomura Shigaraki, the fall of hero society, the Final War, millions dead or displaced — can be traced directly back to one woman’s series of catastrophically bad decisions made out of fear and grief.

Here is the full, merciless chain of how Nana personally created the apocalypse:

1. The Core Mistake: Abandoning Kotaro (The Original Sin)

Her husband is killed by a villain (possibly All For One himself).

Instead of going into hiding with her son, doubling security, or even just moving overseas, Nana decides the safest thing is to completely sever all ties and dump 5–7-year-old Kotaro in an orphanage with zero follow-up.

She even alters the family registry so he can’t be traced back to her and forbids All Might and Gran Torino from ever checking on him.

She leaves only a vague letter: “Mommy has to fight bad guys, so I can’t come home. I love you.”

Result: Kotaro grows up believing his mother chose strangers over him. He internalizes the message “heroes abandon their families.” This becomes the core trauma that defines his entire life.

2. The Ripple Effect: Creating the Perfect Vessel for All For One

Kotaro becomes a successful but deeply broken adult who hates heroes with religious fervor.

He marries, has two children (Hana and Tenko), and enforces the rule: “No talking about heroes in this house.”

He physically and emotionally abuses Tenko for showing any interest in heroism (exactly like Endeavor did to Shoto, but without the “training” excuse).

All For One — who has been searching for Nana’s bloodline for decades — finds Kotaro effortlessly because Nana never changed her surname on public records and Kotaro never hid his hatred of heroes.

AFO befriends the adult Kotaro, stokes his resentment, and manipulates him into having a second child (Tenko) specifically because he wants a blank-slate vessel with Nana’s bloodline.

Nana’s abandonment didn’t protect her family. It gift-wrapped them for All For One.

3. The Final Trigger: Tenko’s Quirk Awakening

Tenko is bullied, isolated, and abused for years because of Kotaro’s hero hatred (which exists only because Nana left).

One day he snaps, Decay manifests, and he accidentally kills his entire family — including Kotaro, whom he murders intentionally in revenge.

A traumatized, homeless 5-year-old wanders the streets for hours while heroes and civilians ignore him.

All For One finds him and raises him as Tomura Shigaraki.

Every step of this tragedy only happened because Nana abandoned Kotaro.

4. The Meta-Layer: Nana Actively Prevented Anyone From Fixing Her Mistake

She made Gran Torino and All Might swear to never look for Kotaro.

This means that for 30+ years, the two people most capable of noticing something was wrong (a hero-hating man named Shimura with a grandson named Tenko) were forbidden from even thinking about it.

If either of them had broken that promise even once, they would have seen the abuse and intervened.

5. The Vestige World Irony: Nana Admits It Was All Her Fault

In the vestige world she literally says:“The scars I inflicted on him got passed down to Shigaraki… If only I had taken down All For One and gone home to my son… I’m sorry, Kotaro. Your mom was weak.”

She watches Kotaro beat child-Tenko and cries, realizing she created the exact cycle of abuse she was afraid of.

She even asks Izuku if he can kill Tomura because she knows some people can’t be saved — acknowledging that her mistake may have made her grandson into a monster beyond redemption.

6. The Scale of the Disaster

Because of Nana’s one decision:

Tomura Shigaraki exists

Decay exists (AFO replaced Tenko’s original Quirk with a modified Overhaul)

The League of Villains forms

All Might is forced into retirement

The Paranormal Liberation War happens

Japan collapses into chaos

The Final War kills untold millions

All For One nearly wins twice

Counter-Arguments (and Why They’re Wrong)

“But All For One would have found them anyway!” → No. AFO only found Kotaro because he was a public, openly hero-hating adult with the surname Shimura. If Nana had kept her son and raised him normally (or even just stayed in contact), AFO would have had no trail.

“But she had to protect him!” → Plenty of heroes have families. Masaki (Geten’s ancestor), Hawks’ parents, the entire Wild Wild Pussycats — none of them abandoned their kids. Nana’s solution was the single worst possible one.

“She didn’t know AFO would groom her grandson!” → She knew AFO was the kind of monster who would target families. That’s why she abandoned Kotaro in the first place. She just never considered that her abandonment would create the perfect psychological profile for AFO to exploit.

Final Verdict

Nana Shimura is the tragic architect of My Hero Academia’s entire apocalypse.

She is simultaneously:

One of the kindest, most heroic characters (mentored All Might, died smiling, believed in saving hearts)

And the single person most responsible for creating the greatest villain in the series

Her good intentions, cowardice, and refusal to trust anyone else with her family directly caused the end of the world.

In marketing, empathy is everything. Just like a mother understands her child’s unspoken needs, a passionate marketer feels the pulse of their client’s business.

It’s not just strategy — it’s care, intuition, and dedication. Here’s to the nurturers, in every form. 💖

So my Hero academia. You know where 2 century ago Quirks Emerged and quickly became a dominant trait in human society. And I started thinking. How long did each holder of one for all hold onto the Quirk.

I started doing some calculations and we were short.

Like half a century Short. About 50 years unaccounted for.

Explain your calculations.

Let's gather what we know in approximately the order it's revealed in.

A baby of light was born 200 years ago

One for All is Yagi Toshinori's (All Might) Quirk there are Seven people before him that have held it.

Midoriya Izuku is the Ninth.

It has Stockpiled so much energy that one's body must be trained to hold it.

Yagi Toshinori has been an active hero in Japan for over 15 years (middle school midoriya) as The All Might's Japan debut was already Old News when Izuku was rewatching it.

Yuui Academia (UA ) is Toshinori's highschool. Also worked in American.

Yagi Toshinori master died in combat.

All for one is as old as the dawn of Quirks (aka 200)

Yoichi All for One's brother is that age. Thus the QUIRK is that age

Yagi Toshinori has been Number one almost his whole Japan career. He is close to 50 Years old

Shinomori Hikage died of old age at 40 he received it when he was 22. Cultivating it for 18 years. Having it for the longest time. Before All Might

All other users died before then.

Shimura Nana met yagi Toshinori while he was in Middle School.

Yoichi was rescued by Kudo and Bruce from a Vault.

Yoichi died by All for one's hand while fleeing with Kudo and Bruce.

Kudo was Targeted with the belief that Kudo Killed Yoichi.

Now we have some information let's do some math. There is some Head canon in here.

Let's say Yoichi died when he was 35

Kudo received noticing a small power holding onto it for close to 10 years as he's a wanted man.

Kudo and Bruce experimented with OFA during the time. Thus the time frame where he then Dies fighting AFO. The Hot potato has been passed.

Bruce figures he is probably also wanted so giving him 10 years is Generous

He finds and teaches Hikage about the Quirk before passing it and facing AFO.

Hikage held onto it for 18 years. He started to rapidly age gifting the Quirk to Banjo.

Banjo becomes or is a Hero he can hold his own so 15 years picking up the wet cat that was En training and giving the quirk to him before cracking the foundation that was AFO's power.

En holds onto it for 10 years as AFO knows the holder. Hero society has a foundation and is gaining traction.

Nana is selected. gaining a husband and kid while holding OFA . She meets Toshinori(11–15) Training him for the Quirk before her death. About 10 years

Toshinori has it for almost 40 years

Now if you add that all together

35+10+10+18+15+10+10+ 40 =143

That's me being generous and on the reasonable.

So they are either as saying we are in the second century of Quirks coming to being. Or I'm underestimated.

But I figured that I would inform you of what I think is an accurate estimate of how long each holder before Izuku would need to hold OFA for everything to be true

Yoichi is 56 when he dies.

Kudo holds OFA for 16 years

Bruce holds OFA for 16 years

Hikage hold OFA for 18 years

Banjo holds OFA for 16 years

En hold OFA for 16 years

Nana holds OFA for 16 years

Toshinori holds OFA for 46 years

Voila 200 years.