GlassJaw
Hero
The Strength Fighter (especially without armor) can focus on Jumping and Climbing, and Athletics generally.
Boost running speed. Maybe bonus action Dashes? Let them Push farther, knock prone, even stun, when hitting.
Break bones. Throw enemies into other enemies.
Hit with sword and grapple to restrain with free hand, at the same time.
I like these but curious about how you see them being implemented. New Fighter Archetype? Expanding the Champion or Battle Master? New combat options? New class?
I'd love to see an unarmored Archetype for the Fighter class.