How'd you make a 3D Donkey Kong game?

[Koopaul]

Rare knew Tooty was "rubbish" as they said in an interview. That's why they never used her again. The best Banjo characters they kept and gave them even bigger roles like Mumbo Jumbo.

Same with Kiddy. They dump the lousy ones and keep the good ones. Eventually over the course of the series, you build a a cast of well liked characters.