She's fierce, formidable, and confident. She faces off against both Tsukasa and Moz despite knowing they're stronger because it's something she believes she needs to do.

Loyal. Kohaku is the first person to trust Senku in the stone world, and her trust in him never wavers. She continues to support him until the end (even when she thought his decision to free Whyman was strange and he said "please," she followed through). This applies to all her friends and Ruri, whom she would do anything within her power to help and keep safe.

(I do think you see her loyalty to Senku the most--he is the protagonist, after all. She has never been his enemy and follows through with his decisions despite not understanding all the science behind it.)

Strong and resilient. Kohaku is strong physically, mentally, and emotionally. Physically, she's the most versatile warrior; she has strength, agility, eye sight, and nimbleness. It allows her to come in clutch on several occasions. Mentally, she's disciplined with training, as well as with how she carried the hot springs water to Ruri daily. This also ties in with emotionally in how she accepts her father's scorn and becomes the "troublemaker" of the village just to improve Ruri's chances of surviving (more on this later since I think it mirrors Byakuya). She is never the victim of her situation; she makes a choice and sticks by it. She does what needs to be done.

Empathetic and emotionally intelligent. Between understanding Chrome's feelings towards Ruri and Senku's feelings towards his dad, she has shown a lot of awareness to how people really feel.

Self-reliant and selfless to a fault. She doesn't asked to be saved and will risk herself to save others without a thought. It's the reason Senku or Gen have to stop her (or fail to) when she runs off to save someone against better judgment (Chome when kidnapped, Treasure Island arc when everyone was petrified, Suika on multiple occasions). She intends to help others regardless if anyone intends to help her.

Open-minded and firm on her beliefs. This was also shown earlier with how she stands her ground to sustain Ruri's motivation/will to live. In addition, though she doesn't understand the intricacies of science, she's still able to believe in it and defend it. She's also not willing to risk sacrificing anyone, which we see when she goes to look for Suika during the grand bout.

Alright, back to how Kohaku is similar to Byakuya. Byakuya is acclaimed to be best anime dad (and he absolutely is; no shade there) for spending decades collecting platinum for Senku.

(Chapter 115)

See that face Senku makes there? You know where he also makes a similar face? Chapter 17.

As in, Kohaku makes a similar sacrifice with the hot springs water and becoming the "troublemaker." Kohaku is very willing to sacrifice herself for someone she loves (not needlessly; she keeps her wits on her). She may look like Lillian, but she has Byakuya's heart. (And yes, what she does is not to the same extent or scale as Byakuya, but she is/was a child and does not have the same kind of knowledge. I do think she has the same almost unfounding belief in Senku and saving Ruri.)

Piggybacking off of what she chose to become, here's a Q&A that states Kohaku can be both solitary or social.

Which means she has more depth than what is usually portrayed in the manga/anime likely secondary to it being a shonen series with an outstanding male cast (yes, I've said this twice because wow, what a cast), but also because we only really see her post-meeting Senku. Kohaku brought him to the village and gave him the manpower he needed, but he, in return, gave her companionship (and yeah, a cure for Ruri). It's easy to forget that she was mostly alone prior to this.

Additional notes: i) I've added each arc name for easier viewing, ii) I haven't added the season numbers since Gintama is counted as an overall series, despite having multiple separate seasons (although, I have added the name of the season in which the episodes appear, e.g. "Gintama°" to refer to S4), iii) some episodes with no whump have been added as to not break up arcs, iv) some timestamps have been added between square parenthesis, v) the format used is for easier browsing, hopefully it holds true for there are many things to scroll through, vi) episodes with a red colouring are to indicate some whump moments I highly recommend watching, vii) I've added some extra characters (like Hijikata Toshiro) here and there because it's good whump and I'm definitely not making another list.

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Gintama (2006-2010):

E009 - challenged to a fight, cut shoulder, bleeding, in pain

Harusame Arc:

E013 - hangover, attacked, outnumbered, manhandled, stabbed, fall from great height, nightmare, bandaged, collapse, in pain, fights while injured to rescue loved ones

E017 - threatened with a sword to his back, cut hand

E027 - [20:00-21:00] ring fight, blow to the side, blood from mouth

Memory Loss Arc: (overall comedic)

E031 - vehicle accident, bleeding, amnesia, bandaged, hospital, worried loved ones

E032 - amnesia (cont.), tied up, taken hostage, protected by loved ones/friends, memories returned

Umibozu Arc:

E040-041 - no whump

E042 - fight, bleeding, hurt arm, self-sacrifice to save loved one, punched

Infant Strike Arc:

E051 - no whump

E052 - cut shoulder, death (imagined)

Benizakura Arc:

E058 - [hit with hammer, black eye, punched (comedic)], sword fight, slammed into wall, slashed chest, stabbed, blood from mouth, collapse, fainting

E059 - bandaged, [slapped, threatened (comedic)], goes to fight despite injuries

E060 - thrown off vehicle (comedic), [22:00] fight against arc villain begins

E061 - sword fight, in pain, wound reopened, heavy breathing, cut, blood on face, unconscious, captured, rescued, thrown, tired & shaking, supported to walk, fight against multiple opponents

E062 - (aftermath of Benizakura Arc:) bandaged, fussed over by loved ones, (otherwise comedic)

Fuyo Arc:

E069 - [scared, fainting (comedic)], pursued

E070 - fight against multiple opponents (no whump)

E071 - punched, blood from mouth, stabbed, bleeding, in pain

Yagyu Arc:

E076-077 - no whump

E078-079 - (whump for Hijikata Toshiro)

E080 - sword fight, slammed onto ground thrice, panting, hit, bleeding, bruised

E081 - [1st half] attacked, hard fall onto structure. rest is comedic/has no whump

Okita Mitsuba Arc: (Hijikata Toshiro whump)

E086 - angst

E087 - angst, goes to fight against mob on his own, shot in the leg, bleeding, covered in blood, dragging his injured leg behind him, using a wall as support, heavy breathing, surrounded, rescued by friends in time, trouble walking, keeps fighting despite injuries, bandaged & using crutches, crying (off-screen)

Shinsengumi Crisis Arc:

E101-103 - (whump for Hijikata Toshiro)

E104 - bleeding, sword fight, held in place by strings which he fights against, cuts around limbs from strings

E105 - sword fight (cont.), cut shoulder

Guardian Dog Arc:

E107 - [17:30+] attacked, grunting, shot in the arm, bleeding, dizzy, poisoned, falls to his knees, outnumbered, pursued, panting, vomiting, slashed, blood on clothes, shot in the stomach, fall into river

E108 - no whump/aftermath apart from visible bandages around his arm

Ghost Ryokan Arc:

E131 - (overall comedic:) scared, attempt to knock himself out by banging his head on a rock, loved ones get possessed by ghosts & leave him on his own

E132 - (overall comedic:) scared, threatened with loved ones' safety & forced to work, crying, treated badly

E133 - locked in a prison cell, referred to as a dog, breaks out of cell, cornered, thrown, blood from mouth, slammed into wall, punched, bleeding, belittled, beaten up

E134 - knuckles bleeding, punched

Yoshiwara in Flames Arc:

E139 - no whump

E140 - stabbed with kunai (comedic), attacked, hit, blood from mouth, thrown onto ground, worried over loved one

E141 - [17:10] stabbed with kunai (comedic)

E142 - no whump

E143 - [16:00+] fight with arc villain begins, severely outmatched, hurt in front of friends, straining, thrown, bleeding, head grabbed & pinned against the wall, groaning, in pain, collapse, kicked, unconscious

E144 - covered in blood, [13:00] wakes up, fights despite injuries, tired, kicked, spitting blood, slammed into wall, hit on his side

E145 - fight (cont.), panting, takes hit meant for friend; stabbed by 3 kunai, bleeding, groaning, on his knees

E146 - [in the beginning] covered in blood

E150 - [05:30 - 07:05] bloodied (special episode, no follow-up)

Tama Quest Arc:

E167 - (overall comedic:) exploded, punched, smashed with a hammer & shrunk

E168 - face grabbed & head slammed by lookalike, headbutted, bloody nose

E169 - butting heads with his lookalike resulting in general harm (for both), lookalike electrocuted

E170 - more infighting with his lookalike, flown into wall, light angst, lookalike loses limbs (& gets them back shortly after)

Red Spider Arc:

E177 - [2nd half:] surrounded

E178 - attacked by arc villain, stabbed with kunai multiple times, bleeding, slammed against wall & strangled, slashed shoulder & back, fall into water, presumed dead, rescued by friend, bandaged, worried over by loved ones

E179 - bandaged (cont.), angst

E180 - bandaged (cont.), fight with arc villain, stabbed through the hand, bleeding, heavy breathing & tired

E181 - no whump

Gintama' :

E209 - [06:30-10:45] backstory, time in war, fighting, bloodied (special episode, no follow-up)

Kabukicho Four Devas Arc:

E210 - (overall comedic:) pretends to have broken bones, spits blood, stuck in trash bin filled with concrete

E211 - jumps into water to save someone, worried over mother figure, running for an extended period of time, panting, holding himself, heavy angst, flies into rage & attacks strong opponent, fight, thrown, stabbed through forearm with sword & pinned, bleeding, grabs blade with his bare hand, punched, collapse, crawls under heavy rain while injured

E212 - bandaged, slammed against wall & yelled at by friend, angst, punched & comforted by loved ones, surrounded by mob

E213 - bandaged (cont.), fight against mob (no whump)

E214 - bandaged (cont.), fight against multiple opponents while hurt, covered in (so much) blood & bleeding, stabbed twice, heavy breathing, slashed, collapse twice & tired, final 'fight' with 'enemy', (even more bandages as aftermath)

Jail Arc:

E225 - (overall comedic:) arrested & jailed, threatened by warden multiple times, hit on the head & bleeding (comedic), threatened by prisoners & lifted by his shirt, 'stolen' item planted on him so that the warden can harass him further

E226 - prison break (comedic), blood on face (not his)

Baragaki/Thorny Arc:

E244 - [~11:00] hit by car & arrested (comedic)

E245 - chain & ball shackled around his wrist that he briefly uses as a weapon (comedic)

E246 - (whump for Hijikata Toshiro), [near the end] Gintoki reveals his own secret identity

E247 - [~11:30] identity revealed and arrested (comedic)

Gintama': Enchousen:

Kintama Arc:

E253 - forgotten by everyone, angst, mindfuckery, [stripped to his underwear, tied up & whipped (comedic)]

E254 - suicidal & jumps off tall building (an act to save someone), rescued by loved ones

E255 - accused of murder, seen as an enemy, pursued & attacked by friends and loved ones, slashed, bleeding, in pain, protects friends even though they're trying to capture/kill him, fall from great height, heavy breathing, stumbling & grunting, holding his middle

E256 - bleeding, fight w/ arc villain, thrown around, sacrifices self to save everyone, comforted

Courtesan of the Nation Arc:

E257 - (overall comedic:) stabbed with kunai on the head, kicked & nosebleed

E258 - surrounded, imprisoned, freed

E259 - fight against multiple opponents, angry, fight with strong opponent, blood on face, falls down stairs, pierced by poisoned darts, bleeding, paralysed, thrown, protected, fights against strong opponent again, (flashback: war time, bleeding, restrained, loved one gets taken away), straining, punched, spits blood, face grab, pierced & paralysed again, so much blood, unable to move

E260 - covered in blood (cont.), shot with antidote, worried over by friend, goes against strong opponent yet again, hurt & bleeding, slammed, pierced multiple times, fall from great height, (flashback: restrained, bleeding, promise with loved one), stabbed through the arm, hit, spits up blood, impact after fall

E261 - covered in blood (cont.), helped to stand & supported by loved ones, [7:10-7:15] bandaged & surrounded by loved ones, [11:51-12:20] bandaged & walking with crutches

Laser Beam Arc:

E262 - no whump

E263 - pretends to be an asshole & goes to fight the arc villain by himself, overpowered, blood on face, stabbed & pinned to the wall by sword, coughing up blood, almost killed, rescued by loved ones

E264 - covered in blood (cont.), removes blade from his side, collapse, grunting & in pain, spits blood, tries to fight despite injuries, trembling/unsteady & using his sword for support, panting, comforted by loved ones, collapses again, worried over by loved ones

Gintama° :

Joi Patriot Reunion Arc: (overall comedic)

E271 - strangled, (flashback: backstory, time in war, covered in blood, bandaged), at gunpoint/swordpoint

E272 - more backstory & infighting with friends, very scared & jumpy, targeted along with friends, surrounded by 'ghosts', gassed, (more blood in flashback)

Shinigami Arc:

E279 - [near the end] blackmailed

E280 - (flashback: imprisonment, flogged, bleeding), fight

E281 - fight (cont.), shot, bloody clothes, collapse, on his knees, (flashback: reason for imprisonment), accepts death, cut neck & bleeding, in pain from being shot, (flashback: imprisonment, prison escape (post torture), bruised, trouble walking, in pain, using wall to keep from falling & holding himself)

Soul Switch Arc: (very comedic) (entries for both Sakata Gintoki and Hijikata Toshiro)

E287 - [Gintoki:] kicked, chased, [both] hit by truck, soul switched between them (& cat's behind), bickering & punched multiple times. [Gintoki in Hijikata's body:] exploded by grenade & bleeding, at umbrella-point, plunged in water, briefly unconscious. [Hijikata in Gintoki's body:] dangled upside down from great height, head hit & bleeding, dragged, kneed & thrown, at swordpoint, plunged in water, unconscious

E288 - [both] surrounded by loved ones who see each as an enemy, stepped on. [Gintoki in Hijikata's body:] at swordpoint, hit & blood on his head. [Hijikata in Gintoki's body:] rope around neck & dragged by vehicle through the street, blood on his head

E289 - [Gintoki in Hijikata's body:] kicked, head slammed & bleeding. [Hijikata in Gintoki's body:] head slammed & bleeding. [both] thrown

Kaientai Arc: (Tatsuma Sakamoto whump)

E290-291 - some backstory but main focus is on Sakamoto, whump for Sakamoto

Shogun Assassination Arc:

E300 - no whump

E301 - pursued, surrounded, (+ whump for Okita Sougo)

E302 - attacked & pursued by multiple strong opponents

E303 - surrounded by strong opponents, face grabbed & head slammed, thrown onto floor & held in place, hit & blood on his head

E304 - covered in blood (cont.), fight w/ childhood friend begins, (flashback: war, bloodied), cut shoulder, hit multiple times, (many flashbacks to childhoood), thrown, stabbed through the wrist, cut multiple times, collapse

E305 - fight (cont.), (more childhood flashbacks), covered in blood, big slash on chest, heavy breathing, punched & spits blood, kicked & thrown back, tired, (flashback: loved ones in peril, forced to choose), hit & punched multiple times, angst, continues to fight despite everything, (flashback: forced to kill, crying, heavy angst), stabbed in the abdomen & shoulder, spits more blood, strong opponent appears

E306 - covered in blood (cont.), heavy breathing, exhausted, trouble standing & picking up his sword, attacked by many, fights again, helped by previous enemy

E307 - covered in blood (cont.), supported to walk, loved ones worried for him, collapse, in pain, in the hospital & bandaged

Farewell Shinsengumi Arc: (picks up right after the SA arc)

E308 - angst, bandaged (for the duration of this arc), using crutches to walk & limping, bruised, angst, surrounded & at swordpoint

E309 - takes punch meant for someone else, bleeding, at swordpoint, handcuffed, rescued by friend & running away

E310 - (flashback: angst, hand shaking)

E311 - no whump

E312 - cut cheek, (+ whump for Katsura Kotaro)

E313 - (whump for Kondo Isao & Hijikata Toshiro)

E314 - cut shoulder, ambushed, stabbed through the wrist, bleeding, hit by blast & pressumed dead, fight with strong opponent, angst, hurt arm, sword on neck & blood drawn, rescued by loved one, heavy breathing, (+ whump for Okita Sougo)

E315 - (whump for Katsura Kotaro & Kondo Isao)

E316 - everyone's in bandages, angst, saying goodbye

Gintama.:

Rakuyou Decisive Battle Arc: (picks up right after the SA & FS arcs)

E317 - nightmare, in hiding, shot at & at gunpoint

E318 - flashbacks to childhood & angst

E319 - shot at, almost falls from great height & rescued

E320 - (whump for Katsura Kotaro)

E321 - (whump for Sakamoto Tatsuma)

E322 - (comedic) fight, illusions of himself killed

E323 - flung back & cannon pointed at him, rescued

E324 - no whump

E325 - picks fight w/ strong opponent, punched & bleeding

E326 - fight (cont.), covered in blood, punched & kicked multiple times, spits blood, face grabbed & held in place, worried loved ones, broken finger, trouble picking up his sword & strapping it to his injured hand, angst, stumbling & collapse, heavy breathing, loved one attempts to protect him & protects loved one instead, slammed against wall & unconscious, wakes up & keeps fighting

E327 - covered in blood (cont.), supported, bandaged & using crutches

E328 - bandaged & crutches (cont.), some angst

Movies:

Gintama: The Movie 1 (2010) (Benizakura Arc) - sword fight, stabbed, bleeding, collapse, nightmare, bandaged, hair pulled, fights despite injuries, knocked out, captured, rescued

Gintama: Be Forever Yorozuya (2013) - (flashback: war, cut, cursed), presumed dead, angst, attacked, fight with future self, hit multiple times, spits blood, hair grabbed & face slammed into a wall, kicked down a flight of stairs, more angst, goes back in time to kill his younger self (unsuccessful), fight against multiple opponents, cut multiple times, comforted by loved ones

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The ones below will be added as a reblog to this post as soon as I finish the anime.

Gintama: Silver Soul Arc: TBA