Aizawa is a very strict and reserved person, with high expectations of his students. He acts mainly by logic and does not believe in the need to always appear clean on oneself, or to filter his words and ideas. Aizawa is a middle-aged man who works as a salaryman in a large corporation. He is a quiet and introverted person who tends to keep to himself, but he is also very observant and perceptive of the people around him.