Some time in the past, Caribou and Coribou became pirates and gained a fearsome reputation for killing Marines.
The Straw Hat ReunionEdit
Eventually, the two brothers managed to reach Sabaody Archipelago, where they allied themselves with the Impostor Straw Hat Pirates. They were first seen in Grove 46, the allies' meeting point, together with some fellow pirate captains. Caribou spotted a Marine spying on them. When the Marine attempted to draw his gun, Caribou injured him with his weapon and then begged God to forgive the man for trying to kill him. He then ordered Coribou to bury the Marine alive as punishment. They were interrupted by fake Luffy, who ordered them to stop.
After the Marines surrounded the pirates at the meeting place, fake Luffy ordered Caribou and Coribou to use the Marine that they injured as a shield. Caribou chooses to disobey the order, instead shooting the Marine for lying to him about not calling reinforcements. He then says that the Marines should do away with the unwritten rule that says that they can lie to criminals. He and his old crew then launch an attack. In the ensuing battle, fake Luffy is exposed as a fraud and captured, while the real Luffy is revealed to the those present.
Despite all the other recruits being captured, Caribou, his brother, and the rest of their crew managed to escape, even capturing the remainder of the impostor Straw Hat counterparts (sans Cocoa and fake Chopper) along the way. He had his crew dig graves for the fakes to be buried alive in. Caribou reveals that he never intended to follow the Straw Hats, having planned to first gain their trust and then kill them from the inside. After that, refusing to listen to the fakes' pleas for mercy, Caribou picks up the Drip fake Sanji and starts to suffocate him with his Devil Fruit power. Fake Sogeking then tries to shoot him, but his body absorbs the shot. Caribou eagerly orders his crew to bury the fakes and happily states that he was able to confirm the real Straw Hat Luffy.
Fishman Island ArcEdit
Into the Depths of the SeaEdit
He is seen in the ocean on his coated ship, following the real Straw Hats, commenting that they had better let him join this time. With their seacow, the Caribou Pirates eventually caught up with the Straw Hats ship and they prepare for battle. Caribou is the first to set foot on the Thousand Sunny. Before his crew can follow, his seacow, which turns out to be Mohmoo fled in fear after seeing Nami, Sanji, and Luffy taking the rest of the Caribou Pirates and leaving Caribou behind. Once Caribou sees that he is left alone, he begs the Straw Hat crew to have mercy on him. After the Straw Hats tie him up, Caribou decides to bide his time and wait for the right opportunity.
When they travel to the deep currents and encounter a sea monster known as the Kraken, Caribou urged the Straw Hats to turn back, but Luffy decides to tame it much to Caribou's shock. Caribou is nervous and is thinking to himself on how crazy the Straw Hats are for not retreating. As he sees Coribou and the other Caribou pirates come to save him, Caribou rejoices only to be let down when the ship is destroyed by the Kraken. He screams in fear with Nami, Brook, Chopper, and Usopp. He then grieves shortly about his crew and scolds Zoro when he says that his crew resemble jellyfish.
In an effort to stop the Monster Trio from endangering the Sunny, and him, he gives Luffy, Sanji, and Zoro a way to fight the Kraken. He informs the Straw Hats about flutter kick coating, which is coating oneself to make a diving suit. When Usopp questions his method, Caribou states that he warned the Straw Hats to run from the beginning. After Luffy, Zoro, and Sanji defeated the Kraken, Caribou was surprised. After the crew entered the Deep Sea, Caribou seemingly vanishes. Brook is the first to notice his absence because he found the rope used to tie him up. He was hiding in a barrel on the ship and was reformulating his plan to kill the Straw Hats, concluding that the best time to do it would be the instant they arrive at Fishman Island.
Franky found him and promptly started sealing the barrel with ropes and metal plates so that he could not escape even if he turned into his liquid form. He begged Franky to let him out, agreeing to be his slave and calling him "Master Bikini Pants." Caribou is still trapped in the barrel as the Straw Hats escaped the eruption of an undersea volcano and arrived at Fishman Island.
Trouble on Fishman IslandEdit
After the ship flew through the bubble surrounding Fishman Island, it fell into a current and the crew gets separated. Caribou's barrel floats in with Luffy, Sanji, Chopper, and Usopp. The barrel eventually makes its way to Mermaid Cove where the four Straw Hats relax and have fun with the mermaids. Two mermaids observe the barrel, noticing that it has been sealed tight, and wonders what was inside. Out of curiosity, they suggest opening it while Caribou remains silent.
After Sanji suffered a near-fatal nosebleed and was taken away by the Straw Hats, Ishilly, [[Fillonce and another mermaid start opening the barrel thinking they might find treasure or alcohol. After Ishilly loosens a few bolts, Caribou pops out and terrifies the three mermaids. As Ishilly, Fillonce and the other mermaid try to flee and scream for help, Caribou quickly proceeds to capture them with his Devil Fruit powers which is identified as the Numa Numa no Mi. Seemingly "satisfied" by the abduction, he resolved to go hunting other prized mermaids in order to sell them at a later date at the Auction House.
His actions indirectly led the citizens of Fishman Island to turn against the Straw Hats, who are the likely suspects, since the fishmen and merfolk are completely unaware of Caribou's presence. While the Straw Hats are taking the heat of the accusations, Caribou kidnaps two more mermaids from the south beach.
Caribou is later seen at Coral Hill hiding in the shadows when Shirahoshi was shown out in the open. After gazing at the princess and seeing her size will bring a much bigger profit than the normal-sized mermaids, Caribou sets his sights on kidnapping her. By the time Hody Jones and Vander Decken IX were defeated, Caribou snuck into the Ryugu Palace and released the mermaids he kidnapped. He stole all the treasures in the palace including the national treasure, the Tamatebako.
Caribou remained hidden in the palace while the royal family and the Straw Hats were having a feast. He is later seen eavesdropping on Neptune and Robin. By listening in on their conversation, he learns of Shirahoshi's value as the Poseidon of her generation, further escalating his desire to ensnare her. When Shirahoshi is going back to her room, Caribou attempts to capture her with his element. He is then interrupted by the Straw Hat's Monster Trio, and got sent flying out of the palace by Luffy. After Neptune told Nami that the Straw Hats could have the treasure if they got it back from Caribou, she sent Luffy, Zoro, and Sanji after Caribou to retrieve it. The trio then find Caribou (who has been knocked out by Luffy's punch) and collect all the stolen treasures.
When Caribou woke up, he decided to inform "you-know-who" about what he learned about the Mermaid Princess as well as getting revenge against the people who took his stolen treasures. He ran into Pekoms and Tamago, who just happened to be carrying the treasures. Thinking that they're the thieves, Caribou attacked them but he was quickly defeated in just one strike by Pekoms, who seemed to be able to use Busoshoku Haki. Pekoms noted that Caribou's overconfidence in his Logia abilities was his downfall.
Wet-Haired Meets the Demon BoarEdit
After Caribou was defeated by Pekoms, he there laying in an unconscious state and after a few hours he had woken up. He had come to see that a whole coward of people were around him, at first Caribou though that he was in heaven or something, after asking for "you-know-who". A voice had came out and asked if he was Caribou, then coming out was Mudon Jiao.
She had revealed that she and some of the tyrant pirates had come to bring Caribou before Kojiro and she had told him that her captain wanted to see him. But Caribou seemed to thing that Mudon was some kind of demon or something, because Caribou had heard of Kojiro before. He commented that he had liked the mans style, but he was going to hell for not praying to "you-know-who" for forgiveness. So it seemed the in the weakened state Caribou was in, he then was knocked out again and seastone chains put on him.
So then having been woken up by Mudon, she had brought Caribou before Kojiro in his throne deck on the Red Tyrant. Caribou at first seemed to have been scared and thus, he tried to run. But he seen that the ship was in the middle of the sea and all of Kojiro's men were there and he couldn't a thing. Kojiro had offered Caribou a chose to serve him faithfully or by force. At first Caribou refused and then he was injected with the Zaimon, with that in his body. Kojiro had him now, so explained the affects of the Zaimon and that he has control over the life or death of Caribou, so he had no other chose. His first mission was to attack a small village and Caribou seemed to have enjoyed that and now faithfully enjoys this, because he had commented that god had given him the treasure that he wanted.