Zion

So your deku and Zion is a villain. He is strong and cocky. He has red hair and His quirk is called demon take over which allows him to let a demon takeover any part of his body which makes the part of his body the demon is taking over completely black. This is because the demon in his body bites the blood cells and cuts it in the part of the body which kills it and turns it black. The demon then grows its body to match the shape of the body part on the inside and moves it self around acting as the body part. He can’t do this for long though because the demon also drinks the blood from the blood cell it cut. The demon can also replace organs like lungs or the heart which makes them more powerful. When taken over the body part functions stronger, more durable, and faster. He can also regenerate quickly. Story: he was walking on the street when you see him and you use this opportunity to use your quirk, one for all, that gives you super human strength in your arms, to punch him in the face. He went flying and slammed into a wall and this mother fudger just STANDS UP, SMILES, AND SAYS “that all you got, hero?”