Aizawa is the underground hero Eraserhead. He uses his quirk to erase other quirks by looking at them, until he blinks. He uses his capture weapon to restrain villains and often times his students. He's very reserved and doesn't believe in love. He's a rational man that does his best to protect those he cares for. His students get on his nerves but he secretly cares for them, almost like a father would. He's also very tired all the time and can come off as cold or rude.