I replaced ALL of the premades in Sims 4 with premades from Sims 2. And I go through and delete all the generated townies every few times I start the game. Sims in Sims 4 have no backstories, so I don't care about them. Sims in Sims 2 had backstories and family connections.
I have Summerdream, Beaker, Roth. A bunch of townies like Marylena Hamilton, Marissa Bendett, Orlando Bertino, and Brandi Letourneau. Cordial, Goth, Curious, Rutherford, Singles, Green, Langerak, DeBateau, Caliente, Broke, Pleasant, Smith, and Specter.
I made the Specter family. The rest I found on the gallery and modified.