How to banish the ugly townies off of The Sims franchise for all eternity + More customization

@Sharonia no, they don't stop spawing if you just follow nerdfashion tips. I want a modless way to assign which sims I want working as npcs, and to stop the game from generating new ones. I know they can add a notification when the game is lacking someone, like if a npc died and I had to replace it.