History Characters / DekiruTheFusionHero

* FriendlyAddressPrivilege: While Katsuki holds "Kacchan" to be an EmbarrassingNickname, he notably only allows Izuku to call him that.

* FriendlyRivalry: He has this with Izuku and Ochako. While it won't stop him from ribbing into them or making jokes at their expense, they get along pretty well when they aren't competing and they even help each other train.

* OOCIsSeriousBusiness: He frequently snaps at Izuku for his self-sacrificing tendencies. [[spoiler:Notably, the one time he ''doesn't'' is during the USJ incident, when Izuku asks him to triple-fuse with him and Ochako to hold off Nomu. With circumstances that dire, Katsuki had no choice but to admit that Izuku's offer was the only option they had left if they wanted the entire class, including their teachers, to survive long enough until help arrived. Notably, after they've defused, Katsuki took all of Katzuchako's nausea]].

* NotDistractedByTheSexy: When Momo [[BareYourMidriff lifts her shirt]], which embarrasses Izuku and Ochako and arouses Minoru, Katsuki only raises his eyebrow in confusion.
* OOCIsSeriousBusiness: He frequently snaps at Izuku for his self-sacrificing tendencies. [[spoiler:Notably, the one time he ''doesn't'' is during the USJ incident, when Izuku asks him to triple-fuse with him and Ochako to hold off Nomu. With circumstances that dire, Katsuki had no choice but to admit that Izuku's offer was the only option they had left if they wanted the entire class, including their teachers, to survive long enough until help arrived]].

* MirrorCharacter: With Izuku. During the USJ arc, it becomes patently obvious that Minoru has a complex about the worth of his Quirk like Izuku had throughout his middle school years. He thinks so little of it that one of the reasons he objected to fusing with Izuku was because he thought not even Human Fusion could improve it. [[SuperpowerLottery He was dead wrong, to say the least]].

* NotSoDifferent: With Izuku. During the USJ arc, it becomes patently obvious that Minoru has a complex about the worth of his Quirk like Izuku had throughout his middle school years. He thinks so little of it that one of the reasons he objected to fusing with Izuku was because he thought not even Human Fusion could improve it. [[SuperpowerLottery He was dead wrong, to say the least]].

* AmbiguouslyBi: She's {{ShipTease}}d enough with Izuku for their fusion to be considered a RomanticFusion, [[spoiler: but she also apperently finds Tsuyu cute]].

A student with a frog-like appearance thanks to her Quirk, "Frog". She actually doesn't fuse with Izuku alone, [[spoiler:instead becoming part of his first triple-fusion, alongside Minoru Mineta.]]

* CoolBigSis: To her siblings, especially in her interactions with [[spoiler:Satsuki]] in Chapter 13.

* TheParalyzer: Her Quirk Mutation allows her to temporarily paralyze the limbs of others on contact with her mucus.

* GoalOrientedEvolution: Human fusion has hints of this. Every fusion has a quirk mutation that is superior to the original quirk, rather than staying the same or some random change. Momo's [[ThePowerOfCreation creation]] costs less energy and gains ElementalShapeShifter aspects, Ochako's zero-gravity is fine-tuned until it is telekinesis in function. This is most prominent in Mineta. Mineta's hairballs become exploding glue bombs that dangle from the fusion's hair, meaning they don't cause bleeding from overuse because they aren't plucked off the scalp.

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* VitriolicBestBuds: With Minoru. He has no problems teasing her about [[spoiler:her crush on Ochako and she smacks him like an older sister would with their younger brother]].

* IAmNotLeftHanded: Even in today's Quirk-based society, Izuku's Human Fusion is something completely out of the left field and thought to be impossible. Everyone who sees it for the first time is left in stunned disbelief, especially when the resulting fusion reveals how powerful he or she is.

{{Troll}}: Will occasionally do things to mess with his components, such as getting launched high above the ocean so they'd fall into it when he unfuses.

* StickyBomb: Has the same Quirk Mutation aa Izoru, but with the added bonus of having sticky mucus as well.

* AdaptationalNiceGuy: Due to ForWantOfANail. Izuku does have a useful Quirk, so he never started mocking Izuku for being Quirkless. Other students still teased Izuku for it (largely with the easy innuendo about fusing with people), so he wasn't interested in being popular. Fusion into Katzuku meant that he and Izuku remained close for their entire childhood. Because of this, the canonical toxic relationship between him and Izuku never occurred, and without a convenient posse and victim he never became a bully. Therefore in the present, he's still abrasive but far nicer to other students and a ''much'' better teammate.

* SmugSuper: He has a rather high opinion on his capabilities. While this isn't unfounded given how powerful he is, it leads to him underestimating his opponents frequently. This bit him in the ass when he went against Izuku and Momo.
** Even moreso against the Nomu, which nearly killed him.

** Ochako starts calling Katsuki "Kacchan" and is more confident than her canon counterpart was at the start of the series.
*** This actually becomes a theme- ''everyone'' who fuses with Izuku starts calling Bakugou "Kacchan," much to his dismay.

* CovertPervert: Unlike Mineta, who is loud and proud with his perversion, Izuku's modesty and shyness tempers it. This results in Izoru being much more shy about his perversion than Mineta ever would be.

* BiTheWay: Besides her ShipTease with Izuku, she's also attracted to Tsuyu.

* BiTheWay: [[spoiler:If her growing crush on Ochako is any indication.]]

** Ochako starts calling Katsuki "Kaachan" and is more confident than her canon counterpart was at the start of the series.

** Minoru becomes less perverted -- or, at the very least, he's better at keeping his perverted thoughts to himself. He's also a lot more confident in Quirk's abilities.

* PsychoticManchild: The best way to describe him is a whiny, entitled brat who hates when things don't go his way.

* BiTheWay: [[spoiler:If her growing crush on Ochako after fusing with Izoru is of any indication.]]

** [[spoiler:Tsuyu starts developing a crush on Ochako]].

* ChronicHeroSyndrome: He's this to the point where it's a serious problem, and it's something that Ochako and Katsuki are constantly trying to beat out of him with how needlessly self-sacrificing and reckless he is. All Might also criticizes this attitude, such as when Izuku took on all of the damage Izuchako took to spare Ochako. According to All Might, if it had been a real battle, Ochako would've been left defending the helpless Izuku rather than both of them being injured but still combat ready.

* SuperpowerLottery: Material Fusion on its own is a decently powerful ability, but it's Human Fusion that takes the cake. With it and One For All at his disposal, there is theoretically no limit to how powerful Izuku can become, because with his ability to merge with different people, he can literally do ''anything''.

** He calls All Might an idiot for using up all his time. He's not entirely wrong, since unless there was some major crisis in the news that they didn't hear about, nothing happened where he needed to step in. He also points out that since All Might knew that he'd be teaching that day, he should have saved up enough time to teach his students instead of letting it waste on things he legitimately didn't need to help with. Izuku ultimately can't come up with any solid defense for his mentor.

An energetic, alien looking girl who became enthusiastic at the idea of fusing with Izuku after witnessing him and Momo fuse during Hero Training. Her Quirk is "Acid", which lets her secrete acid from her skin.

* CowardlyLion: Scaredy-cat he may be, when the chips are down he's willing to step up to the plate, be it as himself or as a fusion.

** Then, when they were forced to fuse, all he asked was that Izuku not make it "weird" and refusing to explain why, suggesting that he's subconsciously embarrassed of his perversion. The resulting fusion, Izoru, later notes that Minoru owes Izuku an apology, showing that deep down he isn't that bad of a guy.

* NotSoDifferent: With Izuku. During the USJ arc it becomes patently obvious that Minoru has a complex about the worth of his Quirk, like Izuku had throughout his middle school years. He thinks so little of it that one of the reasons he objected to fusing with Izuku was because he thought not even Human Fusion could improve it. [[SuperpowerLottery He was dead wrong, to say the least]].
* VitriolicBestBuds: [[spoiler:With Tsuyu after their fusion with Izuku. Their interactions together is like watching a pair of siblings bicker, and they're on a FirstNameBasis now]].

* VitriolicBestBuds: With Minoru. He has no problems teasing her about [[spoiler:her crush on Ochako, and she smacks him like an older sister would with their younger brother]].

* DramaPreservingHandicap: Human Fusion is given multiple drawbacks to make it only feasible as a DangerousForbiddenTechnique, because otherwise it would be a StoryBreakerPower. Even ''with'' the drawbacks, it's powerful enough that Aizawa was genuinely worried about the possibility that Izuku would come to rely on it too much.

* GoalOrientedEvolution: Human fusion has hints of this. Every fusion has a quirk mutation that is superior to the original quirk, rather than staying the same or some random change. Momo's [[ThePowerOfCreation creation]] costs less energy and gains ElementalShapeShifter aspects, Ochako's zero-gravity is fine-tuned until it is telekinesis in function. This is most prominent in Mineta. Mineta's hair balls become exploding glue bombs that dangle from the fusion's hair, meaning they don't cause bleeding from overuse because they aren't plucked off the scalp.
* HeartIsAnAwesomePower: Human Fusion it is the ultimate technique of Izuku's Quirk, the natural culmination of Izuku's fusion ability taken to its most logical extreme; in combination with One for All, the resulting fusions are powerful enough to curb-stomp the other members of Class 1-A easily. [[spoiler: Then there are multi-person fusions, which are so powerful they potentially rival ''All Might'' himself]]. While it takes Izuku himself a while to come to terms with it, everyone else can easily see that his Quirk is most likely the most powerful in all of Class 1-A.

* ThePowerOfTrust: It's implied that Izuku cannot forcibly fuse with someone. He can do it by accident like he did with Katsuki the first time he used the technique, [[spoiler: and with Tsuyu, when he was Izoru and trying to protect her from Shigaraki]], but even then there was a degree of trust between him and the other person. Every other time he's fused with someone, he's had their explicit consent. As a result of that trust, however, the fusions are powerful, more so than anyone student in Class 1-A.

* AdaptationalJerkass: He's notably more prideful and abrasive in the story, considering at his canon counterpart's Pre-Character Development personality being cold and aloof.

** Despite his misconceptions about how Human Fusion worked, it's still notable that Minoru's automatic reaction to it was jealousy, instead of confusion and scorn like Izuku's middle school classmates. Later on, one of the reasons for his initial objection to fusing with Izuku was because he thought the fusion would make his Qurik even more worthless, displaying his own lack of self-worth.