Bowser's Story Beta and Unused Content

Bowser's Story had quite a few ideas that were never used/replaced in the game. This page lists all of them.

Nabbit
Nabbit was originally going to be one of the 4 main heros, but it was decided he was not good enough to to him being on the good side in some games.

Koopa
A Koopa was an idea for a fourth hero, but it was vetoed due to the fact that he was not a major