10. Mumen Rider

Mumen Rider is the 1st Seat in C-Class, and one of the few people who are aware of Saitama's power. In a way, he is also the main protagonist of the Sea Monster Arc.

Mumen Rider is a brave hero who refuses to overlook any crime or back down from any fight, no matter the opponent despite his distinct lack of power. He is incredibly determined, and never backs down, even at the cost of his own life. He is perfectly willing to give his own life if it means protecting innocent people from evil, even when it is clear he has absolutely no chance of success.

He is so adorably weak that we can't help but fall in love with his never say never attitude.