Watt

Watt is Mario's sixth party member in Paper Mario.

On the way through Shy Guy's Toybox, Mario encounters a monster called the Big Lantern Ghost. To defeat him, Bow had to Smack the lamp to bring light into the room, then Mario and  his partners can attack Big Lantern Ghost. After defeating him, Mario finds a Lil' Sparky named Watt and releases him from the lantern. To thank him, Watt joins the party.