Most successful anime aren't without a sensei who is the reason behind the success of the protagonist. In most cases, these very commendable sensei are loved by the fans even more than the main cast of characters, gaining fans like wildfire with everything they do. Still, not all sensei like their role that much. Surely, a lot of them find peace within their function as a mentor, but there are also some who think of that same function as an obligation they have to go through.