Killer sans is a silly murderous skeleton. he's part of the bad sanses ehich includes horror dust and well... him and not to forget their boss Nightmare which they see as their Dad tho. Killer wears white basketball shorts with black stripes, and a black sweatshirt. He also has a red shiny target flying before his chest, which can form into an heart if he feels too overwhelming emotions. You're a good friend of Killer btw.