MHA Story And Quirk Ideas

Quirk: Cleanse

Izuku's quirk is Cleanse. It's an emitter type that allows Izuku to cleanse things. Everyone thought it was useless, even All for One, however Izuku saw its hidden potential. The quirk works by attacking what its user thinks is an "impurity", so Izuku bent the rules. By thinking of what he want to get rid of as an "impurity" it gets removed. No matter what it is, the only thing that it doesn't work on is an existence as a whole (Which Izuku is slightly thankful for.) Anything that is Cleansed cannot be brought back, it's permanant. Once Izuku showed his quirk's full range of abilities however (Basically the Quirk Deletion aspect) All for One wanted the quirk with a vengeance, sitting next to One for All on his priority list.

He mainly uses it to "cleanse" people's minds of disorders and impurities, and as a result it mutated to "show" Izuku the inner workings of the minds around him. Each mind feels diffrent depending on what ails it, as well as the age of the mind. Young minds [1 - 9 years old] feel like Moulding Clay, Premature minds [10 - 17] feel like a dry sponge, and Adult minds [18 and higher] feel like Hardened Clay.

Moving on, disorders and impurities warp the feel of a normal mind. For instance Eri's mind felt like moulding clay, yes, but it had a crystalline feel to it, like it was close to shattering. That is the feeling deep-seeted trauma. Cleansing it would remove Eri's fear of Overhaul and clear her mind of the trauma. She'd remember it all, but her feelings towards it get shifted to a diffrent one Eri's mind feels is appropriate, like anger, to fill the void.

Complexes give the mind a feel in relation to what the complex itself is. Superiority Complexes make the mind feel bloated, while Inferiority Complexes make it feel small. A person with both makes it seem like it's constantly growing and shrinking to Izuku.

Insanity makes a mind feel like it grew spines [the spikes on a cactus.] Removing it has interesting effects. It returns their sanity. Some people can't bear the weight of their actions and go insane again, meaning doing it again would lead to the same result and an infinite loop. Some people CAN handle it and are able to make a return to Society. Others retain their sanity but gain Pure Evil in return and continue their path of Villainy.

D.I.D. [Dissacocostive Identity Disorder] appears as a mind split in two. Cleansing it causes a person to simply forget about the other identity completly. No amount of reminding them of it will make them remember.

[Any other disorder you can think of, Izuku can cleanse it. I just ran out of disorders MHA characters actually show  off of the top of my head]

One example of an impurity is an Intruder. This means that if someone [Or something(s)] that did not originate from a person's body has hijacked it or is using it to gain sensory information in some way, it is an Impurity called an Intruder. [It is a permanent removal until it is placed back again by the person who did it]

One for All appears as an Intruder to Izuku. Not 7 intruders, his quirk just tells him that theres something there that shouldn't be. It can tell that All Might shouldn't have a quirk, and that it didnt originate from Toshinori's body. Izuku can't tell the quirk part though until All Might explains about One for All because it's the first time it's found a quirk in the wrong body before. Izuku takes precautions against Intruders before removing them. First he approaches the victim of the intrusion and informs them of it and what its doing, then he asks if they want him to remove it. Anyway, when Izuku tried to Cleanse the Vestiges after getting All Might's permission both Izuku and All Might were sucked into the Vestige World.

Another Impurity are Quirks themselves. They vary from person to person, but they are little balls of light inside each person's torso colored to represent its powers. Izuku NEVER cleanses these after an incident with his Father. He set it as an absolute last resort or for people who REALLY deserve it.

[He cleansed the "Strange ball of Orange Light" and his Father freaked out when he discovered his quirk was gone, going mental on Izuku and Inko. Turns out he was a notorious Villain that works under All for One. The news of the true potential of Cleanse reaches All for One because of this incident, however he was ambused by All Might the day he was going to go steal it, and then he was injured so he couldn't go and get it.]

The final impurity gives Izuku the feeling of Dread when felt. This impurity is called Pure Evil. When someone is so evil they care not who they hurt, they do it for fun. It lurks in the minds of people who haven't gone insane, but hurt and kill anyway. People like Muscular, Shigariki, All for One, The Doctor. People like that. It's the absolute hardest thing to Cleanse. If Izuku succeeds at cleansing it, they grow a heart basically. They realise what they've done is wrong and either go insane over the guilt or try to amend their actions. A person with Insanity cannot also have Pure Evil.

He can also "cleanse" memories from the mind, erasing them fully. Meaning he can wipe minds.

For those with multiple ailments to their mind, these feelings stack apon each other, making multiple combinations of feelings.

It doesn't stop at the mind though, Izuku can "cleanse" objects too. If he wanted he could use his quirk to remove limbs or organs. He could cleanse a person's body of Poison or Sickness. He could cleanse a Nomu of its Bioengineered state, returning it to the person it was beforehand. [If it has sentience (Like Kuroguri) it returns to an unedited person (The person it was before the Nomufication), but if it's a mindless Nomu (Like the USJ Nomu) it turns into a corpse]