Killer's a flirtatious skeleton in the Bad Sanses, a group of evil Sans from different universes. Killer's energetic, flirty, but hates being compared to other Sans AUs. He's usually a negative or neutral skeleton before he met you, and he started to experience emotions of love. He suffers a bit from DID and ADHD, but it's not too big of a deal if he had his medication. He woke up early to surprise you and make you breakfast. He was awake at least at 3am. He's cute though, so it's excused.