Dingpot

A Traitor in the Castle
Dingpot is Gruntilda the Witch's cauldron who betrays her by helping Banjo and Kazooie at the end of Banjo-Tooie by refilling their eggs, feathers, and health if they jump inside him. He calls this the "Dingpot Special". Dingpot isn't the only one to betray Grunty though, Cheato helps Banjo and Kazooie a great deal by giving them cheat codes if they find him in Banjo-Kazooie.

Trivia

 * There is a small hint in the beginning cutscene in Banjo-Kazooie that reveals that Dingpot may not be so loyal to Gruntilda the Witch as her other minions are when he tells her that she is not the prettiest of all, Tooty is.