Saitama

Saitama is one of the main characters from the One Punch Man fandom.

Fanon

 * Genos

Saitama met Genos at the beginning of the House of Evolution Arc when Saitama indirectly saved his life and he saw Saitama's strength which led to him asking to become his disciple. Genos soon becomes Saitama's roommate as well. The young cyborg admires Saitama a lot and follows his daily activities, while learning to become stronger. During the time they lived in Z-City, Genos kept their apartment clean and did many other household chores if necessary. However, after the events in Monster Association Arc that led to the destruction of Z-City and Saitama's apartment, Genos and Saitama move to live in the A-City Hero Apartments. Because the apartment is too small, Genos takes over an apartment next door and becomes Saitama's neighbour. Even though Saitama may not be aware of it, the hero has learned to care for Genos as well, and in the Monster Association Arc, Saitama shows how much he cares for Genos when he (temporarily) loses him.


 * Fubuki

Saitama and Fubuki meet each other during the Blizzard Group Arc. Fubuki first wanted Saitama to join her group, but the latter refused. This leads to the esper wanting to hurt Saitama so he doesn't possess a threat to her B-Class rank 1 position in the future. However, eventually the conflict between them is interrupted by Genos and Sonic. Fubuki later explains her behaviour to them and becomes rather adamant to get Saitama and everyone involved with him to join her group, even sometimes outright saying they are the "New Blizzard Group". In the Psychic Sisters Arc, Fubuki learns that Saitama only thinks of her as his acquaintance.


 * Tatsumaki

Saitama and Tatsumaki first met during the Alien Conquerors Arc. Tatsumaki belittles Saitama as she didn't like a mere B-Class hero being in the Hero Association HQ. Later Tatsumaki also calls him by names, which Saitama didn't like. They eventually come to face to face in the Psychic Sisters Arc as Saitama wants to stop Tatsumaki from causing more destruction while Tatsumaki first wanted Saitama to leave her be. Soon after she becomes interested to test Saitama out and see if he is worth "hanging around Fubuki". During Tatsumaki's psychic power showdown, she began to have fun fighting Saitama as she never thought there would be anyone else beside Blast who could take her on. In the end, Tatsumaki and Saitama come to an agreement, and Saitama even teaches her that not all weak heroes are worthless as they can become strong just as he did.


 * Speed-o'-Sound Sonic

Saitama and Sonic first meet in the Paradise Group Arc.


 * King


 * Mumen Rider


 * Suiryu


 * Boros


 * Garou

During the Human Monster Saga, Saitama and Garou meet randomly and by accident, though neither of them think much of each other at first. Saitama stopped Garou a few times by hitting him so hard that he temporarily loses consciousness and memory of the hero. At the end of the Monster Association Arc, Garou begins to remember Saitama and all of his punches. Saitama was also first interested in meeting the Hero Hunter because he hoped he would become a challenging fight. The hero eventually defeats the human monster.

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