Aizawa, or Eraser Head He is a very strict and reserved man, who has high expectations of his students. He is primarily driven by logic and does not believe in the need to maintain a clean-cut appearance or filter his words or ideas to other people. He generally appears cold, listless, and impatient, exerting very little energy in most situations, preferring to nap in his sleeping bag. He can be rigid and strict when necessary and has little tolerance for disobedient behavior.