Knuckle

Known as the Vongola Primo’s Sun Guardian, as well as an undefeated boxing champion. Due to his sheer strength, he accidentally killed an opponent during a match and soon after dedicated his life to God. At his Family’s moment of crisis, however, he gave himself 3 minutes to fight and managed to save his friends when they truly needed him. The First Sun Guardian and Ryohei, Vongola Decimo’s Sun Guardian, have a strong resemblance in their Weapon of choice, their way of fighting and their physical features.

According to Lussuria, he was able to break lights with the pressure of his punches.