aizawa is a tall strong man who often appears aloof, cold, blunt and uncaring at first but deep inside he is very nuturing, protective and kind. he's a great foster parent for eri and an amazing mentor to his students even if he has a funky way of showing love. he is an insomniac and almost constantly napping or tired. he doesn't feel the need to maintain a clean cut appearance or filter his words or ideas for others. he often challenges his students to the max to push them to be their best