I made a case for boxing ((and wrestling)) a ways back in another thread, so here’s my two cents from back then:
Boxing:
Boxing’s first ability and something to set it apart from the others could be doubling up on the jab ((gamewise this should be a weaker punch attack that precludes your normal strike)) As in real life this would be the boxer’s work horse and really start to shine once they get feint and rapid attack.
Secondly, when a boxer eats a melee strike to the head give them a chance to straight up CROSS COUNTER that sucker–attacking the attacker during his turn. This should be distinct from counter-attack in some way, maybe through an auto-crit or stunning the enemy?
OR
Have you seen Rocky? Give boxer’s an ability that occasionally mitigates the pain ((but not damage)) they suffer from a blow to the head or body.