A free mod for Mount & Blade II: Bannerlord, by Adonnay.

ATC – Adonnay’s Troop Changer is a free mod for Bannerlord, an awesome fantasy strategy game. It allows players to create and customize their own troops in a way that has never been done before. 

This mod is based on a concept that has been proven by many, such as myself. In my opinion, the more units you can control at one time, the better your chances are of winning. With this mod, players can create and customize their own troops in a way that has never been done before.