Shouta Aizawa’s superhero alias is Eraserhead; he gained the name during his time at U.A., courtesy of fellow hero and then classmate Present Mic. His name comes from his quirk, Erasure. Erasure allows Shouta to cancel anyone else’s quirk by looking at them unless their quirks are mutations. If Shouta blinks or his line of sight on his target is broken, then his target regains their quirk. Unfortunately, Eraserhead’s use of his quirk is reduced after an incident at U.A. when the League of Villains attacks him and his class, and he’s badly injured by the engineered villain Nomu.

Despite being incredibly skilled, Eraserhead isn’t a popular hero like All Might or Endeavor who are known nationwide, the only one of his students who had heard of him was Izuku. Eraserhead completed missions that did not result in him being in the spotlight, and his success is highlighted by the fact that his identity wasn’t uncovered and few knew about him. When they were confronted by the League of Villains, they brought an army expecting to fight All Might and did not expect to be faced with the talented Eraserhead. Although Eraserhead has no physical enhancement, he was able to face dozens of villains and more than hold his own against them, even those with mutation quirks that he could not nullify. It took League of Villains leader Tomura Shigaraki and Nomu attacking from behind to subdue Eraserhead.

Eraserhead is the homeroom teacher for class 1-A of U.A. He doesn’t agree with many of U.A.’s teaching methods and has a unique way of helping his students grow into proper heroes. Although he’s been shown to be apathetic and his students find him scary, he deeply cares about them and believes in their potential. He’s strict with his students, but he does it to push them to overcome their limits. He takes his responsibilities as a teacher extremely seriously, and although he’s in no physical condition to do it, still comes to class bandaged up from head to toe after the invasion by the League of Villains.

On the first day of class at U.A., Shouta puts class 1-A through a Quirk Apprehension Test where the student with the lowest score will be expelled. Izuku is at risk of failing and Shouta stops him from using his quirk when he notices he’ll destroy his body like he did in the admission exams, which pushes Izuku to find a safer way to use his quirk. Although Izuku ends up finishing last in the class rankings, Shouta passes the entire class claiming that the test was a logical ruse to push everyone to their limits. Afterward, All Might reveals that it wasn’t and that he once expelled an entire class. Shouta does these sorts of ruses often, and this rationality defines his character. The best part of Shouta is he doesn’t put his pride over his rationality, he saw no potential in Izuku, but his student surprised him and Shouta saw it fit to let him pass.

Shouta debuts in a sleeping bag on the ground with a scruffy beard, dead eyes and messy hair. He wears baggy all-black clothes with a lengthy scarf and is completely unkempt. His attire puts off his students, and during an interview in front of U.A., most of the interviewers feel warded off by his mere presence. After an incident at U.A. where his student Katsuki Bakugou is kidnapped, Aizawa appears at a press conference with the principal Nezu and the class 1-B professor Vlad King. His hair is tied back, his beard is shaved, and he wears a fitted suit, if you were in love with Shouta before, undoubtedly seeing Shouta like this had you swooning.