Transformation

Transformations are a type of magic spell that transform Banjo and/or Kazooie into a different species or object. Since their debut in Banjo-Kazooie, transformations have also appeared in Banjo-Tooie and Banjo-Kazooie: Grunty's Revenge. Transformations are usually done by Mumbo Jumbo, although in Banjo-Tooie, they are handled by Humba Wumba instead. Transformations serve various and specific purposes, such as the ability to access certain areas or to talk to certain characters.

Banjo-Kazooie
In Banjo-Kazooie, all transformations are invulnerable to hazardous terrain, can all fit in small spaces, and can all climb slopes too steep for even the Talon Trot. Most transformations cannot attack, and most of them can walk underwater with no need for air. Each transformation costs five Mumbo Tokens to unlock, and are only available in a specific level. However, it is possible for Banjo and Kazooie to exit into Gruntilda's Lair while they are still transformed, as some rooms have Jiggies that can only be obtained while Banjo and Kazooie are transformed.

Very rarely, Mumbo Jumbo mistakenly turns Banjo into a washing machine just before correcting himself. Mumbo Jumbo also mentions that he would transform Banjo into a T-Rex, but he changes his mind and breaks the fourth wall by saying that the transformation is intended for the next game.

Banjo-Tooie
In Banjo-Tooie, transformations cannot exit their host world. However, there are a few exceptions, including Stony, who can enter Hailfire Peaks, and Dragon Kazooie, who can enter any world. Most of the transformations are able to attack. The transformations have varying amounts of health, which is often also affected by how many Extra Honeycomb Pieces Banjo and Kazooie have.

Banjo-Kazooie: Grunty's Revenge
In Banjo-Kazooie: Grunty's Revenge, transformations are once again handled by Mumbo Jumbo and require Mumbo Totems to use. Similar to Banjo-Tooie, most transformations have the ability to attack. Unlike the Nintendo 64 games, any transformation is usable in any of the worlds as long as it has been unlocked in its initial world.