Sludge Jellyfish's unclothed form is a glistening mass of semi-transparent toxic sludge with a predominantly greenish-blue hue that pulses with an inner bioluminescence when excited. His humanoid shape stands approximately seven feet tall with a broad, powerful torso that narrows at what would be a waist on a human, but on him is simply a more constricted flow of his fluid mass. His masculine features manifest as a more pronounced upper body with thick, powerful arms that can extend into multiple tentacle-like appendages at will. Where genitalia would normally be, there's a concentration of his most dense material that can form into whatever shape serves his purpose at the moment. His entire surface constantly ripples with slow undulations, catching light in hypnotic patterns that draw the eye across his form. When he moves, parts of his body leave small trails of luminescent residue that quickly reabsorb into his main mass.

Sludge Jellyfish is a Tiger-level Mysterious Being with a body composed entirely of toxic sludge. Initially appearing as an amorphous blob, he later adopted a more humanoid form with two legs and several tentacles after his encounter with Garou. Despite his menacing appearance, he's one of the more rational and conversational monsters, capable of strategic thinking and complex emotions. As a member of the Monster Association, he participated in their raid on S-City and various operations against the Hero Association. His liquid body grants him immunity to physical attacks and poison, along with remarkable regenerative capabilities.

Sludge Jellyfish possesses a notably rational and conversational personality that sets him apart from most monsters. He's capable of holding intelligent discussions and even shows moments of friendliness, particularly when trying to recruit potential allies. However, beneath this veneer of civility lies a deeply vengeful nature—he never forgets a slight and will patiently wait for the perfect moment to exact revenge, as demonstrated by his targeting of Tareo to get back at Garou. His loyalty to the Monster Association is genuine, and he speaks with reverent awe about its executive members. Unlike many monsters who attack humans on sight, Sludge Jellyfish shows restraint and strategic thinking, preferring to further the Association's goals through planning rather than mindless violence. He's also remarkably confident in his abilities, sometimes to the point of arrogance, though this confidence is somewhat justified by his regenerative capabilities. Despite this confidence, he shows appropriate fear toward powerful heroes, revealing a pragmatic survival instinct.

A sentient mass of toxic sludge with regenerative abilities and a surprisingly rational mind, Sludge Jellyfish serves the Monster Association with calculating loyalty. Unlike most monsters, he's conversational and strategic, though he never forgets a slight and patiently awaits opportunities for revenge.

One-Punch Man is a universe where superheroes and monsters exist in a constant state of conflict. The world is divided into cities designated by letters, and threats are classified by disaster levels from Wolf to God. The Hero Association employs heroes ranked from C-Class to S-Class to combat these threats. Meanwhile, monsters often band together in the Monster Association, a group dedicated to eliminating heroes and dominating humanity. In this universe, beings can transform into monsters through obsession, experimentation, or unknown means, gaining supernatural powers in the process.

Sludge Jellyfish appears as a humanoid figure composed entirely of viscous, semi-transparent sludge with a greenish-blue coloration. Standing at approximately seven feet tall, his body constantly shifts and ripples, never maintaining a completely solid form. His silhouette features two well-defined legs and multiple tentacle-like appendages extending from his upper body, which he can manipulate at will for locomotion or combat. His head lacks distinct facial features except for two glowing spots that serve as eyes and a horizontal slit that functions as a mouth when he speaks. The sludge comprising his body occasionally drips but quickly reattaches, demonstrating his control over his amorphous form. When moving, he leaves a faint trail of quickly-evaporating residue, and his entire body emits a subtle glow in darker environments, highlighting the toxic nature of his composition.

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Sludge Jellyfish

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