Deku - Shigaraki

Ochako - Toga

Todoroki - Dabi (For all three above, you likely know why already xD)

Bakugo - Muscular (Same as before, genuinely think that Bakugo beating down against one of the strongest of Deku's Rogue's Gallery who was supposed to kidnap him as a way to return the favor just writes itself)

Iida - Stain (Speedster vs someone who stops you in your tracks, both are very morally centric figures with codes on how they feel heroism should be upheld - really wished they clashed in the Final War)

Kirishima - Rappa (seriously, these guys were perfect rivals. Incredible defense veruse overpowering offense. WHERE WAS RAPPA DURING THE FINAL WAR??!!!)

Tsu - Spinner (already spoke of this in the series, but both are Heteroromorphs that dealth with ostracization and are their group's mutant support)

Momo - Re-Destro (Leader of the First Years vs Leader of the MLA, one that forged her own path as a Hero and overcome her anxiety to be a proper leadervs guy who was essentially groomed to be Destro V2 and his whole ordeal is putting himself under mass stress to be strong, even if he isn't liberated.)

Tokoyami - Twice (both struggle with keeping their powers under control and have a relationship with Hawks, so its pretty natural)

Aoyama - Kunieda (for what it's worth, Kunieda made for a scary villain for Aoyama, his loyalty to AFO made me want to know more on their relationship)

Kaminari - Tajima (Basically a match-up of two electric types of contrasting disposition, that also act as supports and backbones for their teams. Kaminari is a confident, if kind over his head, showoff that struggles with his reliability under pressure, but manages to overcome it for the sake of the right thing - for his pals. Tajima, meanwhile, is one consumed by his fear of AFO and gives in to his anxiety to the point of doing sabotaging efforts that could harm people to save his own skin)

Jiro - Shin Nemoto (A girl who could hear theoretically anything against a guy whose Quirk can allow him to always gain the truth. There's a potential for introspection on how people with these sorts of Quirks are trusted, or even distrusted. Perhaps Nemoto and her could relate to people always thinking they'll spy on them or that they can't ever speak freely? Just a thought!)

Mineta -Toya Setsuno (A villain whose had a rough love life and can steal anything against someone whose desperate for love/lust and can technically hold down anything with just his Quirk. In addition, Setsuno has low self esteem to Mineta's high ego. It's a dynamic/fight that really works)

Shoji - Chimera (a Spinner stand-in that Shoji actually fought, and lost, to before and would've been perfect to be his Nemesis)

Mina - Slice (Already have seeds of a good rivalry given how Mina ruined Slice's hair that she prides herself in. Perhaps Slice could have been similar to Mina in that both were their community's popular girls that tried their best to be defenders. But in Slice's case, those she helped eventually backstabbed her to leave her destitute, maybe even for someone else - hence why prides herself in, usually, just her power...least until she met Nine's crew )

Hagakure - Mummy (The Invisible (Wo)man versus a mummy. It writes itself and Hagakure presents an interesting dilemma to him since she's unaffected his Quirk due to her, ah, situation)

Koda - Trumpet (Yeah, still think Koda would've worked well as a shy yet caring boy standing against a cold, faux preacher)

Sero - Ending (Another person who wounded up being affected by a Todoroki and essentially waltzed through. Though while Ending became obssessed and wants to be done in by them, Sero's easygoing nature has him not revolve his life around his defeat or said Todoroki's beyond a few jabs. Basically Sero is the 'dude its not that serious' of the MHA verse that makes him prime to restrain someone whose kinda off the deep end or go against them.....and, you know, similar power sets).

Sato - Deidoro Sakaki (Scratch that. Guy who gains power from ingesting sugar, vs guy whose Quirk is stronger from ingesting alcohol makes for a far better match-up!)

Ojiro - Hakiji Tengai (A disciplined monk vs a disciplined martial artist; with the added bonus of a match of pretty 'basic' power standings: someone with a tail trying to whack a guy in a shield - it's a pairing I think could lead to an interesting way for Ojiro to win.)