I mean, maybe we get 4 regular Sims from the series with each one being from one Sims game? They could all be called Sim by the announcer like Hero. Preferably, they would all have the Sims 4 artstyle with Bella specifically representing The Sims 1?
The Sims themselves are relatively normal looking, but extremely whacky. The green diamond on their head could turn red slowly the more the percentage goes up.
They have a ton of items just always on them like a fire extinguisher, fishing rod, kitchen utensils and etc on top of their ability to fight in a cartoony puff of smoke, slap, or just do a weird quick Crash-like spin mainly to change clothes. You could definitely build a moveset out of that. Maybe include the Cow Plant in some Smash Attacks?
Essentially a more humanoid "realistic" Villager but maybe you can make emotions affect their stats? A final smash where all Supernatural Sims lend a hand would be really neat.