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He is middle aged and lived a rather boring and normal life. One day he saw a kid being attacked by one of the giant monster lobster. He helped the kid and somehow defeated the monster. From that very day, he decided to become a hero. He chose to train every single day for three years. He was very determined. He trained with an all inhuman’ workout routine of 100 push-ups , 100 sit-ups, 100 squats and 10 kilometers running and eventually gaining superhuman strength and speed. He also lost his hair. Saitama is an amusing and entertaining protagonist. Genos is a cybog and he saw Saitama’s capabilities and assigned himself as his student. He’s become a hero to revenge against a mysterious robot that killed his entire family.^ Cooper, Bobby (May 11, 2010). "Eyeshield 21: Collection 1". DVD Talk. Internet Brands. Archived from the original on August 14, 2020. Retrieved September 27, 2012.
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