Caribou

"Wet-Haired" Caribou is an infamous rookie pirate who was at the Sabaody Archipelago around the time of the Straw Hat Pirates' reunion. He has a bounty of 210,000,000, making him part of the new generation of rookie pirates with bounties over 100,000,000. He is the brother of "Blood Splatterer" Coribou, another infamous rookie. Both brothers gained their reputations for killing Marines. As both of them have bounties of over 70,000,000, they both fulfill the requirement of the Impostor Straw Hat Pirates.