Octopus is the only transformation in Banjo-Kazooie: Grunty's Revenge that can go in the water in the worlds Spiller's Harbor and Freezing Furnace. It can go in water that's harmful to normal Banjo without being harmed. It isn't used a whole lot in the game, and has a simple attack to defend against Mines- he shoots small spurts of water.
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Octopus Banjo in Banjo-Kazooie: Grunty's Revenge.
Transformations in the Banjo-Kazooie Series 
| Banjo-Kazooie Transformations: | Termite Banjo · Crocodile Banjo · Walrus Banjo · Pumpkin Banjo · Bee Banjo · Bottles' Bonus Alterations · Washer Banjo |
|---|---|
| Banjo-Tooie Transformations: | Stony Banjo · Detonator Banjo · Van Banjo · Submarine Banjo · T-Rex Banjo · Washer Banjo · Snowball Banjo · Bee Banjo · Dragon Kazooie |
| Banjo-Kazooie: Grunty's Revenge Transformations: | Mouse Banjo · Candle Banjo · Octopus Banjo · Tank Banjo |