King/Relationships

Saitama
King is extremely appreciative of Saitama. As the hero that saved King from Octopus Claw Man and later Giant Bird, King holds Saitama in high esteem and considers him an extremely powerful hero. King is the closest thing Saitama has to a friend. He offers Saitama advice on issues, and they play and share video games. King has total faith in Saitama's abilities, to the point of facing down Elder Centipede with only Saitama as back up. He feels guilty about how he took credit for killing 5 monsters that Saitama killed.

Eventually, he feels so guilty over his lies that he vows to himself to get stronger and tries to become a disciple of Bang to do it, showcasing the positive impact Saitama has had on his life.

Tatsumaki
Tatsumaki believes King is a respectable fighter and respects him for his strength. King is one of the few figures that Tatsumaki will back down from on matters.

Genos
While the exact nature of their relationship is unknown, the two are shown to be friends. Like most characters, Genos is unaware of how weak King is. King holds some kind of respect and care for Genos, as seen when he was worried about Saitama's teachings to him.

Superalloy Darkshine
Despite Darkshine's immense physical strength and prowess, he still acknowledges and respects King's title of the "Strongest Man on Earth" (which, ironically, could've possibly been Darkshine's title if not for King's status). Darkshine sees King as stronger than even Tatsumaki, shown when he tried to calm her down after she berated the "Strongest Man on Earth". Darkshine also says that King is one of the three S-Class heroes not to anger, comparing the hero to himself and Tatsumaki.

Sweet Mask
King hates dealing with Sweet Mask and admits to having trouble dealing with him, although Sweet Mask is just as easily swayed by King's reputation as most other heroes.

Atomic Samurai
After the Monster Association was defeated, Atomic Samurai comes across King in a sushi restaurant and challenges him to battle. They agree to an apple-cutting test due to Atomic Samurai claiming he can know how someone lived their life by how the apple was cut. King is unable to pull the sword from its sheathe and simply walks away, but Atomic Samurai believes King sliced through the apple so cleanly and swiftly that the apple never realized it had been cut. This causes Atomic Samurai to intensely respect King and call him an outrageous monster.