Regeneration: Sludge Jellyfish possessed a form of regeneration stemming from his liquid body. His body seemed to naturally absorb all liquids including flammable liquids. Physical attacks did not have much effect on the monster. Liquid Body: Sludge Jellyfish's body was made up of liquids and therefore had no discernible weak points. Not much is known about Sludge Jellyfish's strength, except that he was one of the few known monsters with regenerative abilities.

He is later revealed to be alive when he appears in the middle of Child Emperor and Evil Natural Water's fight, but his oils are absorbed by Evil Natural Water, leaving his body as a shriveled husk and permanently killing him. Filled with confidence in his liquid body, the monster arrogantly attacks the hero only to be blown apart by the oils Child Emperor injects into his body. When Child Emperor breaks into Waganma's jail cell, Sludge Jellyfish attacks the hero. He states that there is no way humanity can win, and even King will fall. At the mention of King's name, Sludge Jellyfish becomes frightened, but confidently states the whole purpose of the Monster Association is to eliminate such heroes, and goes on to mention the executive members of the Monster Association, speaking in awe of their strength and remarking they must have been created by God. Waganma disagrees, and says the Hero Association has plenty of heroes, and goes off to list the names of several heroes, such as Metal Bat and King.

Sludge Jellyfish goes to the cell where Tareo and Waganma are being held and tells them there is no hope for either of them to be saved. Afterward, he, Royal Ripper and Bug God kidnap Tareo back to the Monster Association HQ as a hostage. His action causes Garou to be distracted long enough for Bug God and Royal Ripper to deal multiple fatal blows to him, making Garou seemingly appear dead. He later surfaces again during Garou's fight with Bug God and Royal Ripper in which he captures Tareo to mess with Garou for attacking it earlier. Sludge Jellyfish then leaves alongside Phoenix Man. Unfortunately, the invitation is rudely turned down. While angry, Sludge Jellyfish still tries to invite Garou to join the Monster Association. However, thanks to its regenerative abilities, Sludge Jellyfish survives Garou's attack. After the fight is finished, it tries to kidnap Zenko, only to be intercepted by Garou and brutally smashed by him for watching over the hero hunter. Sludge Jellyfish is first seen watching the battle between Garou and Metal Bat alongside Phoenix Man.

The three monsters corner Mohican and Pineapple, who are carrying Narinki and his son Waganma. Sludge Jellyfish is first seen in S-City accompanied by Phoenix Man and Rhino Wrestler. Plot Human Monster Saga Monster Raid Arc He engaged in a conversation with Tareo and Waganma. Like Phoenix Man, Sludge Jellyfish was one of the few rational monsters, who wasn't prompt to kill humans or attack them on sight. However, he was very confident in the power of the Executive Members of the Monster Association, stating that they would defeat all the heroes, and it was as if they were created by 'God' himself. Like most monsters, he was rather fearful of powerful heroes such as King and Tatsumaki, and was scared at the mere mention of their name. However, Sludge Jellyfish did not forget the incident and got revenge by holding Tareo as a hostage to mess with Garou: his vengeful side showed itself again when he prepared to kill Child Emperor and openly admitted he was the type to hold grudges. He even tried to invite Garou to join the Monster Association despite the latter attacking him. Sludge Jellyfish was one of the more friendly monsters to appear, alongside Phoenix Man. Sludge Jellyfish was a walking blob of sludge.ДЄfter his first encounter with Garou, Sludge Jellyfish adopted a more humanoid appearance and changed his form so that he had two legs and several tentacles.

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