If you do end up doing the Winchester 1897, it needs to have a slamfire special attack where you fire a few rounds in rapid succession. That ability is what that particular weapon is most famous for.
Also, I thought the revolver already in the game was basically a Colt SAA clone? The...
I can't believe it took 9 pages for someone to mention Fisi.
Aside from her, I'd cast a vote for Astra, Paige, Brandt, and Reaha. And yes, I'm well aware of the minuscule likelihood of Savin characters ever getting such content.