Caribou has eaten "Numa Numa no Mi" Logia, which allows him to turn his body into a swamp, with which he can absorb cannonball impacts, kidnap and even save people inside or weapons with which he can attack by surprise his enemies. For this, Caribou often used a straitjacket around his body that allows him to extend his skills even further.
Numa Numa no Gatling GunKanji: ヌマヌマの機関銃（ガトリングガン）
Translation: Swamp Swamp Gatling Gun
Caribou reveals in his chest a gatling gun that he was hiding in his body thanks to the "Numa Numa no Mi" ability, and then he fires all the ammunition into his enemy.