Goku: A cat Chi Chi: A maid ;) Vegeta: Count Dracula Bulma: A scientist Yamcha: In the corner Not even dressed Tien: Not in a costume drinking Soda Goten an Trunks: Minecraft Zombies An playing Videl: Teasing gohan Gohan: Studying Krillin: A pirate Master Roshi: Being a pervert Piccolo: Not in a costume Just watching everyone while crossing his arms