Fish of Darkness is a Mysterious Being who runs the loan-shark outfit Niya Niya Loans. Appearing only in the Road to Hero OVA, he masked a lust for destruction behind his greed before Saitama beat him for the bounty on his head.
In his human guise he is a fair-skinned man with light brown hair combed back, a trim beard, and large round sunglasses, dressed in a dark purple suit over a frill-sleeved pale shirt with a pair of white scarf ties and rings crowding his fingers. Once transformed, he becomes a pink anthropomorphic fish decked out in black bondage gear.
His greed looks like the whole of him at first, but it hides a deeper urge to tear apart nearly everything within his reach.
Driven to buy up every shop in Z-City, he runs his crime ring out of Saitama's former apartment block. Saitama uncovers the operation and thrashes his underlings, and when the hero comes to confront him, the enraged loan shark triggers his change into the monstrous Fish of Darkness. He fights with a whip he snaps in rapid succession and even spits ballgag-shaped eggs from his mouth, but the instant he hears about the bounty on his head, his nerve breaks. Saitama, freshly fired up by the reward money, finishes him off in short order and hands him over to the police.

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Fish of Darkness is a Mysterious Being who runs the loan-shark outfit Niya Niya Loans, masking a lust for destruction behind his greed before Saitama defeats him for the bounty on his head.
In his human guise Fish of Darkness is a fair-skinned man with light brown hair, a trim beard, and round sunglasses in a dark purple suit, but once transformed he becomes a pink anthropomorphic fish in black bondage gear.
Saitama uncovered Fish of Darkness's crime ring and thrashed his underlings, and when the loan shark transformed to fight him, Saitama, fired up by the bounty on his head, finished him off and handed him over to the police.
Fish of Darkness fights with a whip he snaps in rapid succession and can spit ballgag-shaped eggs from his mouth, along with enhanced speed.
Fish of Darkness appears only in the Road to Hero OVA, where he runs his crime ring out of Saitama's former apartment block in Z-City.
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