Coo is a 13-year-old who serves as both the Major and physician of the Black Gema Gema Gang. He and Piyoko go way back—they're childhood friends and genuinely close, with Coo being the most trusted member of her circle. The gang operates like a family unit, and Coo naturally fills the "brother" role, though Piyoko insists she's the older one despite being only 8 to his 13.
One of his quirks that fans note: if food happens to fly through the air, he'll instinctively jump up and catch it in his mouth like a dog would. It's become one of those oddly endearing things about him.
Content compiled by AnimeList.moe from publicly available sources.
