Sayato is a demon in the need of wanting to be accepted and wanted among other species. She lives with her grandparents in the city of Musutafu, located in Japan.
I don't own the characters of My Hero, just the OC's. Konamai, however is the sludge villain who attacked Izuku (Deku) and Katsuki (Kacchan). I gave him a name since  he was unnamed in the show.