Fighter. It goes with everything!
Even split multiclassing, get your second feat at level 6!
Eldritch KNight / Abjurer : You're so tanky, the game automatically renames you into Tavy McTanktank.
Assassin / Battlemaster : Everything drops before they act.
Full on Fighter? Three attacks per action, action surge gives you six attacks unhasted. WHOOOO
Two level dip on *any class? Yup. It works. Fighting style, Action surge, equipment proficiences..
