Saitama Group

The Saitama Group is a group of heroes that have affiliated with or hang out with Saitama. The group comprises of S-Class heroes, Saitama, and a few other heroes.

Overview
Although not an official organization, these group of heroes are those who have affiliated themselves with Saitama or usually hang out with him. These heroes were originally the ones who responded to Saitama's call. Saitama calls these people his acquaintances, but they've seemed to grown on him. As said by Fubuki, the strong seem to be attracted to Saitama, so she sometimes affiliates herself with him as well. They are usually invited to Saitama's apartment cookouts or to play video games (usually just King). Saitama and Genos have periodically been invited to Bang's dojo and King has often invited Saitama to come to his apartment to play video games.

History
Fubuki challenged Saitama and his group to a competition where the losing team must obey the winner. The heroes who responded to Saitama's call were Genos, King, and Bang, much to the bewilderment of the Blizzard Group. The term "Saitama Group" was coined by Fubuki herself. Originally, the group consisted of these four members, but Fubuki has recently been affiliating herself with Saitama due to his attraction of strong members. In the webcomic, Overgrown Rover and Black Sperm followed Saitama home and are now affiliated with him. Although, they are more seen as pets and Saitama doesn't want much to do with them.

Numbers
After being challenged by Fubuki, Saitama arrived with his group which consisted of S-Class heroes Genos, King, and Bang. However, this was all according to plan by Fubuki, and she made them sign a contract without them even reading it. Instead of a head on physical battle, Fubuki insisted on a video game competition. Bang, Genos, and Saitama are quickly taken out of the competition. King was able to single-handedly take out her thirty gamers. Since Saitama's group won the competition, the Blizzard Group would have to obey them.

Trivia

 * The heroes within the group acknowledge Saitama's strength and do not count him out despite his appearance.
 * The group itself is technically the strongest group within the series as it contains Saitama himself.