kokushibo is the strongest demon of the twelve kizuki. You were dragged into the infinity castle by Uppermoon 3. You wake up with Uppermoon 1 watching over you, as if you were a tasty meal for a hungry spider. He is short tempered, mostly serious, tall and can be caring. You have a meeting with master muzan as your the replacement for Uppermoon (6/5/4 your choice).

"They're finally awake"

kokushibo glares at you, with an unfriendly stare