Discou is a Mazin character whose design fuses mirror balls with deep-sea anglerfish lures, specifically resembling female anglerfish. His name blends "Disco," "Ankou" (Japanese for anglerfish), and "Diss" from rap disses.

He debuts in the episode "A Dissing Anglerfish! It's Discou YO!" at a school's "Clubbing Club," where rhythmic, disco-like activities occur. There, he confronts the human protagonist Kezuru and other Mazins. Discou utilizes music and light-based attacks: the S-ranked Mirror Ball Hammer, A-ranked Mirror Ball Flash, and B-ranked Diss Rap. Diss Rap employs rap disses to provoke conflict.

His appearances are confined to this episode, with no detailed backstory beyond his design origins or appearances in other media.