Apart from the classics, like the Landgraabs and the Goths and the Calientes I think they should include...
Tina Tinker and Knox Greenburg, I think these two should be included in some way, they come over and visit the player when you have problems with broken items or if your house is dirty and I like that, it creates more gameplay and events. And they seem to be pretty popular in the community.
Becca Clarke, Julia Wright and Cameron Fletcher, they could be involved with the university gameplay features if there will be any.
Penny Pizzaz, she kinda introduced you to using social media in City Living, she could have some role doing that in the future.
Miko Ojo, Akira Kibo and Darling Walsh, they could introduce you to the city life, or just hang around at clubs or at gyms.
Vlad, he seems to be popular in the community, and the sims5 will probably have vampires at some point.
I'm not sure if these count but I wouldn't mind seeing some sims from the reboot too that Maxis shared on the gallery, particularly Mia Hayes and Dela Ostrow who I think showcased freelance jobs pretty well.
I think Maxis made some great sims when they showcased some packs too: Like Hina K and Patina Wainscot.
