Red Roc Monkey D. Luffy

Skill 1: Gum-Gum Roc Gatling: The Supreme King Haki enhanced version of the Gomu Gomu no Elephant Gatling. After inflating both his fists, hardening them with Armament Haki, and infusing them with Supreme King Haki, Luffy activates Gear 2 and performs his Gomu Gomu no Gatling. This was first seen being used against Kaidou.

Skill 2: Gum-Gum Red Roc: A combination of Gomu Gomu no Elephant Gun and Gomu Gomu no Red Hawk. Luffy activates Gear 3, inflating his fist, and by channeling advanced Armament Haki into it while using Gear 2, ignites it to deliver a huge flaming hardened punch. This technique was strong enough to knock down, burn and injure Kaidou, whereas none of his other Gear 3 or Gear 4 attacks could do anything to him beforehand. This was first seen being used against Kaidou.