Black Sperm

The following section contains Webcomic spoilers. You have been warned manga-only readers.

Black Sperm (黒い精子, Kuroi Seishi) is one of the few Dragon monsters in the Monster Association, who first appeared during the S-Class Heroes' attack on the Monster Association.

Appearance
Black Sperm is a humanoid monster with a fully black body and a white face, with an antenna on top of his head.

Personality
Black Sperm seems to be very confident in his abilities and dislikes when other people "look down on him". He appears to care little for the lives of humans as he was about to kill the child kidnapped by the Monster Association without remorse.

Monster Association Arc
Black Sperm appears when Busaiku is separated from Garou. Black Sperm chases after the kid in hopes of killing the child. Atomic Samurai steps in and manages to allow the kid to run to safety. However, Black Sperm soon overwhelms Atomic Samurai due with his ability to split into numerous versions of himself, as well as regenerate whenever.

When Tatsumaki destroyed the Monster Association HQ, Black Sperm and several other Dragon level monsters emerged from the rubble to attack her. After, Psykos temporarily cuts off Tatsumaki's psychic power, Black Sperm grabs Tatsumaki in a giant arm and attempts to crush her. The esper was saved by Genos, but the cyborg immediately had his arms ripped off by Black Sperm and Gums. Black Sperm and the rest of the monsters then proceed to watch Psykos play around with Tatsumaki until Genos decided to attack Fuhrer Ugly. Before Fuhrer Ugly could retaliate, Bang suddenly joins the fight and effortlessly kills two of the Monster Association's remaining members before being knocked out by Homeless Emperor. Black Sperm then takes this opportunity to knock Bomb unconscious.

Black Sperms decides to continuously beat up Genos until King finally decided to take a stand. The remaining members of the Monster Association then try to think of a way to take on King. After King managed to buy some time against the remaining monsters, Tatsumaki began to recover and turn the tide of the battle. In an attempt to defeat her, Black Sperm fused one trillion copies of himself into the much stronger Multi-Cell Sperm. Unfortunately for Black Sperm, the newly formed sperm is effortlessly killed by Tatsumaki. Afterwards, Black Sperm sends a thousand copies of himself to perform a kamikaze attack against Tatsumaki to buy time as he takes Busaiku hostage, thus forcing the heroes to simply stand and watch as he fuses ten trillion of himself into his ultimate form, Golden Sperm. This new form proves incredibly dangerous, as Golden Sperm is able to take down Tatsumaki so fast that nobody else could even follow his movement with their eyes. However, this victory proves short lived, as the newly mutated Garou shows up, destroying 99 of the 100 remaining copies of Black Sperm and killing Golden Sperm after a brief battle that none of the heroes could even see. Now down to only one life, Black Sperm slips away to watch the battle from afar.

Third Eye Arc
The next day, after encountering Saitama, Black Sperm and Overgrown Rover follow him home as pets. The two formerly dangerous monsters are currently entrusted to Butterfly DX and Chain'n'toad due to Forte losing a bet with Saitama.

Abilities & Powers
As a high-ranked member and a Dragon-level Mysterious Being of the Monster Association, Black Sperm is an extremely powerful being.

Physical Abilities
Immense Speed & Reflexes: Dodged Atomic Samurai's attack, and when transformed into Golden Sperm he blitzed an injured Tatsumaki.

Immense Strength: Contrary to his appearance, Black Sperm has great strength and was able to badly damage Atomic Samurai in one hit. He was also capable of lifting a huge boulder and Golden Sperm could keep up with Garou for a few moments.

Enhanced Durability:

Shapeshifting: Black Sperm is able to increase in size and manipulate his body shape in any way he chooses.

Regeneration: Instead of being killed, Black Sperm will only regenerate or split into even more copies of himself if he still has enough cell stock.

Fighting Style
Coalescence (合体, Gattai): Black Sperm permanently combines his cells to form a more powerful version of himself. The more cells that he combines, the arrogant the created version of himself will be.
 * Multi-cell Sperm (多細胞精子, Ta Saibō Seishi): Any number less than ten trillion of cells that combine. The strength of this form has yet to be observed as the only Multi-cell Sperm observed was quickly taken out by Tatsumaki.
 * Augmented Strength:
 * Augmented Speed & Reflexes:


 * Golden Sperm (黄金精子, Kogane Seishi): Requires at least ten trillion cells to create. This form vastly increases its powers and is able to defeat an injured Tatsumaki.
 * Augmented Strength:
 * Augmented Speed & Reflexes:
 * Psychic Resistance:



Kamikaze Attack : Black Sperm sacrifices a number of his cells to attack a target. This has been mainly used as a distraction.

Major Battles

 * Black Sperm vs Atomic Samurai
 * Black Sperm, Psykos, Gums, Homeless Emperor, Evil Natural Water, and Fuhrer Ugly vs Tatsumaki
 * Black Sperm, Psykos, Gums, Homeless Emperor, Evil Natural Water, and Fuhrer Ugly vs Bang
 * Black Sperm vs Genos
 * Black Sperm, Psykos, Homeless Emperor, and Evil Natural Water vs King
 * Black Sperm vs Sweet Mask
 * Black Sperm vs Tatsumaki
 * Black Sperm vs Garou

Quotes

 * "All heroes except Tornado, please form a line and wait for your turn to be killed."

Trivia

 * ONE stated that full power Tatsumaki could have beat Golden Sperm.