rgoodbb
Adventurer
Another fun thing to do is to give your Barb/Rogue the Defensive Duelist feat and then grapple/prone opponents before beating them to death at advantage (+ sneak attack) while they feebly try to attack you back.
It's unfortunately not compatible with the Shield Master approach unless you have three arms.
That sounds even more unkillable! But I lose the iconic (in my mind) shield cuff to knock someone down. Hmmff. I'm now looking at the Grappler and Tavern Brawler feats but they don't seem to offer much that I couldn't already do.