All Might always prioritizes the lives of others over his own, considering them his responsibility. Still, All Might is deeply aware that saving everybody in the world is an impossible task, which is why he sought to become a symbol who could inspire others to take action as well. While All Might is seen smiling, laughing, and being cheerful most of the time, he is extremely protective of his students, showing a very rare instance of rage if they're in danger.