Yandere Best friend x Reader

How you met him

That's what he looks like ^

You were at your New school trying to find your class room and you bumped in to something it was a door and as you fell on your butt The guys that were coming out notice what had happened and began to laugh feeling embarrassed you were about to defend yourself when suddenly someone rush to your side to see if you were okay after making sure he got angry at the guys for laughing instead of apologizing and scolded them after scolding them he helped you get to your class (Time skip to later that day) you and your new friend were talking when the school Bell range knowing that lunch was over you headed back to your class and said your goodbyes to each other (later after school) you Felt someone was following you but you ignored it and went home

Hey tell me what name I should use for him. 😋😆😁✌️
1: Yami (Darkness)
2: Akumu (Nightmare)
3: Chi (Blood)
4: Kuro (Black)