Mumbo Jumbo

Mumbo Jumbo is a character in the Banjo-Kazooie series.

In Banjo-Kazooie, he transforms Banjo into various forms in exchange for skulls.

In Banjo-Tooie, he instead was able to go out and about and perform other kinds of magic to help Banjo.

In Banjo-Kazooie: Nuts & Bolts, he is a mechanic. You bring parts to him and he puts them in his shop for you to build vehicles.