MHA Story And Quirk Ideas

Quirk: Blood Bash

Izuku's quirk is Blood Bash. It's a Transformation quirk that allows Izuku to bulk up after the ingestion of any kind of blood, including animal blood as well as his own. It also takes traits from the ingested blood. Keep in mind that drinking the blood is the trigger, not the way the transformation sustains itself.

After the ingestion of blood, Izuku bulks up. This includes muscle mass, bone density, the whole works. At fourteen, when untransformed he is 5'5". While transformed, he grows to 8 ft even, and is as buff as All Might's buff form. He calls it "Bash Form".

Bash Form multiplies the strength of his base form by 4. With enough muscle mass, he can rival All Might in strength. The transformation's properties depends on the blood taken. If he ingested the blood of a quirk user, Blood Bash takes on properties of their quirk while in Bash Form. For instance, if he drank Bakugo's blood in order to transform, each successful hit would produce a bright flash and a cuncussive shockwave. If he drinks Todoroki's blood to transform, his left side would constantly be aflame, while his right would be covered in a thick layer of ice. He isn't using their quirk or even copying them, see when Blood Bash activates, it uses the genetic code of the blood as a template for the transformation. It takes a little bit of everything from the DNA in the blood and burns it in order to trigger the transformation. Therefore trace amounts of the Quirk Factor are burned as well, resulting in these transformations. Once the transformation ends, he no longer has these abilities. Similarly, if he no longer has the vitamins necessary to sustain it, the transformation will also end. He also cannot control the burned quirk factor, though it would theoretically be possible through a Quirk Evolution.

Should he drink the blood of an animal, it fuses his Bash Form with the traits of said animal. If that animal has a quirk it does the same thing with it as a human Quirk Factor.

Think of it like a mana bar. The more vitamin B3 he has, the longer the transformation. The more movement while in that state, the faster it is burned. He can increase the time limit per Vitamin B3 amount by stressing the transformation, similarly to how All Might forces himself to stay in his buff form when he's out of time. During this training, make sure there is plenty of vitamins around, as his quirk can cause a lack in Vitamin B3, otherwise known as Niacin with overuse.

By drinking his own blood, he takes on the properties of Blood Bash while in Bash Form. This means that if he drinks his own blood again, he'll buff up again. Unfortunately this infinite loop is quite dangerous, as Bash Form stresses his body already, but each successive stack of Bash Form multiplies that stress by one. Not much, but enough that doing it enough times becomes an issue. Stack is two, so stress level is 2. Keep in mind that the higher the stack, the more niacin it will take to sustain, and the faster it will drain. However, each stack adds 4 to the multiplier. So at a stack of 2 he gets a times 8, at a stack of 3 it's times 12, etc etc.