Knuckle  

Vongolas First Sun Guardian, ナツクル

The Vongola Primos Sun Guardian is both an undefeated boxing champion and known for his immense strength. During a match, he accidentally killed an opponent, leading him to dedicate his life to God. In a time of crisis for his family, he gave himself just three minutes to fight and successfully saved them. The First Sun Guardian and Ryohei, the Vongola Decimos Sun Guardian, share many similarities in their weapon of choice, fighting style, and physical appearance. Lussuria claims that this individual has the ability to break lights with the force of his punches.