Warhammer 40k Rogue Trader has origin classes that define your character's base model and uniform, that you stack archetype classes on top, as well as armor and other stuff. If possible, I want someone to add versions of origin classes but with base models of NPCs, like Guardsmen uniform (possibly with color variants?), basically Commissar and Commissar(guardsmen model), Military General and Military General(guardsmen model), etc.
or, if possible, add Adepta Sororitas, Mechanicus, Space Marine and Aeldari/Drukhari for custom character creation as origin classes, there are already playable versions of them in-game, being unique to your companions, but in a nutshell they're basically slightly modified versions of other origin classes with a few unique skills and perks.