Saitama

Saitama is the main character of One-Punch Man and a hero whose self-training has made him overwhelmingly powerful. Because even the strongest opponents offer almost no challenge, hero work has become boring rather than exciting, leaving him searching for someone capable of testing him.

His laid-back attitude and plain appearance contrast with his strength. Saitama often lets opponents explain themselves and power up before ending the fight abruptly with a single punch.