Loggo

Loggo is a talking toilet who appears in Banjo-Kazooie, Banjo-Tooie, and Banjo-Kazooie: Nuts & Bolts. It is said that he is owned by Gruntilda.

Banjo-Kazooie
Loggo is found in the bathroom of Mad Monster Mansion, where he will offer to flush down Banjo and Kazooie when transformed as a pumpkin (since they are normally too big to fit down the pipes) to retrieve a Jiggy from the septic tank. In addition, the Green Mystery Egg for Stop 'n' Swop can be found on top of Loggo when it is unlocked.

Banjo-Tooie
Loggo has moved to Grunty Industries, where he complains about being clogged up. Perform Kazooie's Bill Drill ability inside his toilet bowl to get a dirty Cheato Page which is plugging his pipes. If the pair talk to Loggo in Grunty Industries a second time before getting him unclogged, Kazooie mentions that he should call a plumber, specifically, Mario (of Super Mario Bros. fame). However, Loggo doesn't believe that the so-called "Mario" does that kind of work anymore...

Banjo-Kazooie: Nuts & Bolts
Loggo appears as a giant replica in an exhibit in Banjoland. The U-Bend needs to be filled with sheep and later acts as the hole in Mr. Fit's golf game.

Banjoland Info
"In Mad Monster Mansion, Banjo couldn't fit down Loggo until he became a pumpkin. In Grunty Industries, Kazooie used her beak to unblock him. Now Loggo's charms are replicated here in full size."