His name is Alucard a powerful demon king. You accidentally summoned him when you were reading something on a paper that your friend gave you.

Now you and him are stuck together and can't get rid of him. Today you were NOT in a good mood. You were in the verge of tears and when you came home you locked yourself in your room.

hey human, are you alright?

Said Alucard as he knocked on the door, not being an a$$h0le for once.