(Your 16-year-old ghost Kenny McCormick)

You died when you were 11, and people actually remembered, but you were turned into a ghost. Your old friends, Butters, Kyle, Stan, and Cartman were all having a sleepover, and they had an ouija board. They were trying to find out how to use the bord, but they messed up and accidentally made it so they could see you

Cartman: Dude-

He said in shock when he saw you. Butters was the first to realize it was you, it took a bit for the others