Sludge Jellyfish

Sludge Jellyfish (ヘドロクラゲ, Hedoro Kurage; Viz: Hedro-Jellyfish) is a member of the Monster Association and an ally to Phoenix Man. It is one of the Mysterious Beings who assaulted S-City alongside Elder Centipede.

Appearance
One of its most notable features is, that Sludge Jellyfish looks like a walking blob with two eyes. It has goop like skin and filaments. Because its appearance, it leaves a trail like a snail.

Personality
Sludge Jellyfish is one of the more friendly monsters to appear, alongside Phoenix Man. It even tried to invite Garou to join the Monster Association despite the latter attempting to kill it. However, Sludge Jellyfish did not forget the slight and got revenge by holding Tareo hostage to mess with Garou.

Monster Raid Arc
Sludge Jellyfish is first seen in S-City accompanied by Phoenix Man and Rhino Wrestler. The three monsters corner Mohican and Pineapple, who are carrying Narinki and his son Waganma. Sludge Jellyfish is first seen watching the battle between Garou and Metal Bat alongside Phoenix Man. After the fight was finished, it tried to kidnap Zenko, only to be intercepted by Garou and brutally smashed by him for watching over him.

However, thanks to its regenerative abilities, Sludge Jellyfish survived Garou's attack. It got angry, but still tried to invite Garou to join the Monster Association. Unfortunately, the invitation rudely turned down. Sludge Jellyfish then leaves alongside Phoenix Man. 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 Sludge Jellyfish earlier. His action causes Garou to be distracted long enough for Bug God and Royal Ripper to deal multiple fatal blows towards him, making Garou seemingly appear dead. Afterward, he, Royal Ripper and Bug God carry Tareo back as the Monster Association HQ as hostage.

Abilities and Powers
Not much is known about Sludge Jellyfish's strength, except that it's one of the few known monsters with regenerative abilities.

Physical Abilities
Regeneration: Sludge Jellyfish possesses great regeneration. It was able to regenerate back from a pile of goo after being brutally smashed by Garou.