I made a Sim modeled on Morgan Wade, a singer-songwriter-future rock star I've been obsessed with the last two years. I've also made Sims who were my attempt to capture characters I knew from video games like GTA: my Sims 3 legacy started from a character named "Sage", who was based on the radio announcer for Radio X in San Andreas. From the gallery, I've saved loads: I have the entire cast of Strange New Worlds, for instance, and Red Dead Redemption 2: I have various actors I like (Anna Kendricks and Natalie Portman, for instance), and the casts of shows like How I Met Your Mother or The Office. In The Sims 2 I'd found sims who looked like Jake Gyllanhall and Barack Obama (the latter was impressive for TS2's tools), and as far back as TS1 I remember having 'skins' for Mariah Carey and Britney Spears. Some of these sims are just for decor, but some are good dating stock for my Sims -- especially Christopher Pike and Sadie Adler. My Sims 4 and Stardew Valley characters tend to have a mirror of each other in the other game.
I'd like to try capturing Lina and Savi from Neo Cab next.
