Sim Models, Females, Males: NPCs: Base Game Service Sims – Strenee Sims.NPCs (Non-Playable Characters) shouldn’t be ugly Sims! Replace your Base Game Service Sims with these fully dressed, unique Sims. No CC (custom content) is necessary or mods. NPC Service Sims are those Sims that show up when you call them. For example when you hire the maid, order a pizza or need a firefighter.