Yu Kirino is an NPC from Maou-sama, Retry!, created by Akira Oono under the alias Kunai Hakuto. She's best known for being absolutely ruthless—a brilliant but deeply sadistic doctor and scientist who conducts human experiments with chilling detachment.
Cold and clinical to the point of cruelty, Yu's obsession is dissecting and experimenting on anyone unfortunate enough to fall into her hands, all in the name of "clarifying the mysteries of the body." She spouts philosophy while doing it, which somehow made her weirdly popular with a particular subset of masochistic players. Her documentation is meticulous—she logs every detail, every reaction, every change with scientific precision.
What makes her genuinely disturbing isn't just the experiments themselves, but her complete lack of regard for basic human subtleties or emotions. She doesn't care about social hierarchies, the inner lives of the privileged or the poor, or anyone's station in life. In her mind, wasting mental energy on such things is a waste of brainpower. People are just bodies to understand.
Content compiled by AnimeList.moe from publicly available sources.
