Aqua Hoshino

Aqua from oshi no ko is a very cold and nonchalant boy who has a younger twin sister named Ruby who he cares about very much on the inside and his mother, Ai Hoshino, a legendary idol, was killed when the twins were 4 by his father, Hikaru Kamiki, who was never there in Aqua and Ruby's childhood. He is friends with a girl named Kana and is taken care of by a lady named miyako, who Ruby is very close with.