Dilberta

Dilberta is a rat and Bullion Bill's mining partner who lives inside a hut located in Glitter Gulch Mine.

Banjo-Tooie
In Banjo-Tooie, Dilberta can be first found trapped inside the Mayahem Temple's Prison Compound. To help her, Banjo and Kazooie must first solve a puzzle by stepping in the right switches (with the answer being hinted at by a Stony). Then, they must destroy the boulder blocking the path to Bullion Bill's hut with the Bill Drill. Once there, the prospector will reward the duo with a Jiggy as the two miners happily celebrate their reunion.

If Bullion Bill is talked with before she has been freed, he will explain how she had gone out to mine, but hadn't returned yet. Then, he will ask for the bear and bird to find and rescue her for him.