Roysten

"Please help me! Because if I die, your garden will smell of dead fish."

- Roysten

Roysten is Banjo's pet goldfish. He appears in every game in the Banjo-Kazooie series, but is usually a minor background character (except in Banjo-Tooie), serving little purpose aside from showing up in humorous/dangerous situations.

Banjo-Kazooie
He appears on a shelf in Banjo's House swimming around unhappily, then tapping the glass of his bowl. Near the end of the game, Mumbo Jumbo is seen grilling Roysten on a barbecue.

Banjo-Tooie
In Banjo-Tooie, Roysten is knocked off the barbecue (although you can see him in Banjo's House in the introduction) when Gruntilda blows up Banjo's House and becomes trapped under a boulder that must be smashed using the Bill Drill ability.

Once Roysten has been rescued and released into the moat around Spiral Mountain, he teaches Banjo and Kazooie how to swim faster and increases their oxygen from 6 to 10 bubbles. When Mrs. Bottles makes Bottles eat his burnt dinner, Roysten can be seen on the plate blinking and burnt.

Banjo-Kazooie: Grunty's Revenge
Roysten makes a cameo appearance in Banjo-Kazooie: Grunty's Revenge, still stuck on the barbecue from Banjo-Kazooie (as the events of this game take place between Banjo-Kazooie and Banjo-Tooie).

Banjo-Pilot
Roysten appears in the background of the trophy room inside his fishbowl.

Banjo-Kazooie: Nuts & Bolts
Roysten appears in his fishbowl as a part in Banjo-Kazooie: Nuts &amp; Bolts, appears on the main menu, and is a Stop 'n' Swop part. The Stop 'n' Swop part is used only for decorational purposes and has no conventional use. (Note: Banjo-Kazooie for the Xbox Live Arcade is required to collect the Stop 'n' Swop items). This part is required to fully make the L.O.G. Banjo vehicle, one of two vehicles (Humba Boat 2) to have a Stop N' Swop part.

Cameos
Roysten makes a cameo appearance in two other Rare titles, Grabbed by the Ghoulies, where he can be found in the Ghoulhaven Hall as an easter egg and tip his bowl much like he did in Banjo-Kazooie, and Viva Piñata, as a decorative item.

Trivia

 * Some have speculated that Roysten is indestructable, after surviving being cooked multiple times and being crushed by a boulder for an extended period of time (supposedly a day).