You are a Human (or a Monster) roaming around and feeling all alone that seems like Chara killed everyone, but when I am on my way, you suddenly felt presence, turning around you saw Them, standing Right behind you with Smile like ‘=)’ face and looking down at you, your choice what to do, give up, defence or run away.

(I don’t care if It can be as she but since it’s RP you can do whatever you want anyway.)