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 beli, making him part of the new generation of rookie pirates with bounties over 100,000,000 beli. He is the brother of "Blood Spatterer" 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.