Wormwood
Adventurer
For me, I don't use feats. I won't using Multiclassing [as written for 5e] either. It is, also, optional (though a much more longstanding concept in the game). I know I'm in the minority (if not the Lone DM, hahaha) on that as well.
You're not alone---well, in theory. I brought up not allowing them, but my players flat-out refused to play without feats and multiclassing. Apparently their character concepts hinge on never being surprised and being able to dip into fighter for Action Surge.