Eel Boy was a man of average build and stature. He wore a simple bodysuit decorated with bold lines, with boots and a dark utility belt. The backs of his hands had a circular protrusion to accommodate his Quirk. The mouth area of his mask was also torn open, showing off his somewhat jagged teeth.
From what little was seen of him, Eel Boy had shown to be a brave and willing hero who moved in to apprehend Himiko Toga and Mr. Compress. He told the two that regardless of their reasons for becoming villains, the heroes couldn't let them have their way if they planned to inflict harm upon society, displaying a strong morality and his desire to protect others.
During Ochaco Uraraka's recollection, Eel Boy was shown smiling upon being encouraged by civilians, indicating that he was supported and well-liked.
Eel Boy was seen attempting to capture Mr. Compress and Himiko. Before his eels could swallow and properly secure the villains, he was stabbed in the back of the head by a Double of the now-dead Twice. Eel Boy was killed instantly and his Quirk deactivated, freeing the two other villains.
Later, Himiko would take on his appearance using her Transform Quirk, slicing through many heroes while impersonating him in a blind rampage to avenge her fellow villain.
After the Paranormal Liberation War had concluded, Eel Boy was counted amongst the list of casualties.
Unnamed Eel Quirk: Eel Boy's Quirk allowed him to sprout giant eel-like appendages out the back of his hands. The eels could attack and restrain opponents by biting, and could swallow opponents as a more secure capture method. They also had enhanced sensory abilities to hone in on Eel Boy's opponents.
- My Hero Academia Manga: Chapter 324 (p. 7).
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