Black Sperm/Relationships

Gyoro Gyoro
Black Sperm did not respect Gyoro Gyoro's authority. Despite this, he still followed his advice in battle, choosing to engage with Atomic Samurai after being consulted to do so.

Like the rest of the Monster Association, Black Sperm was unaware of Gyoro Gyoro's connection to Psykos, and was surprised when he discovered a woman was behind the organization.

Orochi
Unlike most of the Monster Association, Black Sperm held little respect for the Monster King Orochi. He had no interest in helping Orochi rule the world, and only joined forces with them in order to stand a chance against the Hero Association. Black Sperm also believed he could even defeat Orochi in battle, if it came down to it.

Homeless Emperor
Although they didn't have any explicit interactions with one another, Psykos claimed that the two of them working together could kill any opponent.

Atomic Samurai
Black Sperm's confident personality clashed greatly with Atomic Samurai's, and the two quickly formed a rivalry. Atomic Samurai looked down on Black Sperm due to his odd appearance and status as a Mysterious Being, enraging Black Sperm. He managed to defeat the swordsman, and made sure to taunt and torture him afterwards.

Saitama
After witnessing Saitama defeat Evil Natural Water and subsequently the awakened Garou, Black Sperm came to fear and respect his incredible strength. Later, he tried to follow Saitama home and become his pet, believing it would be safe to stay with such a powerful being. He assumed that Saitama wouldn't kill him due to his mercy earlier on Garou and Overgrown Rover. Saitama was not so pleased with Black Sperm, and didn't want to look after him.

King
Like most monsters, Black Sperm was very cautious when dealing with King. He hesitated to attack him when his fellow executives hesitated as well, showing he did not believe he could fight the strongest man in the world alone. When King almost used his special attack, Black Sperm panicked, and was relieved when the attack never came.

Tatsumaki
Black Sperm was eager to fight Tatsumaki, one of the Hero Association's strongest heroes. When she continued to easily defeat his cells, he got frustrated by being toyed with by a "brat." In a way, he wanted to prove his strength to her, and continually faced off against her. When Golden Sperm was created, he finally got his chance, and was able to overpower the weakened esper.

Garou
Black Sperm initially didn't think much of Garou, and was surprised when Gyoro Gyoro implied he would be made an executive immediately upon proving his loyalty to the Monster Association. When Garou reappeared in the final battle with the heroes, Black Sperm was again surprised that Garou had survived for so long. He was surprised once more when Garou's new strength was able to quickly destroy thousands of his cells at once. After witnessing this, Golden Sperm decided to take him seriously.