Brawler

Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.

Heavy Hit. When you score a critical hit with an unarmed strike the target has disadvantage on attack rolls and ability checks until the start of your next turn.

Bare Knuckles Fighting. Add half of your proficiency bonus(rounding down) to the damage when your make an unarmed strike.