Quick answer — Gen Hoshino voices Senpai in The Night is Short, Walk on Girl, Buddha in Saint☆Onii-san, Otou-san in Mirai.
Gen Hoshino voices Senpai (The Night is Short, Walk on Girl), Buddha (Saint☆Onii-san), Otou-san (Mirai).
Senpai is voiced in Japanese by Gen Hoshino.
