One Piece: I Got a Naruto Character Card from a Sign-In Reward at the Start

After transmigrating into the world of One Piece, I became a prisoner at Impel Down. Just as I was losing hope, I activated a System. But what the hell is the point of giving me a Hokage System in the One Piece world? "Ding! The Hokage character possession System interface has been successfully constructed. You have been awarded a beginner's starter pack." "Ding! Starter pack opened successfully. You received one Naruto character card for Might Guy, along with ten uses of the Host's possession ability." After Qin Chuan saw these System messages, a smile finally appeared on his face! That night, Impel Down sent an urgent notice to Marine Headquarters! "Please, send someone to help us right away! There's a prisoner locked up on the first level who's nearly destroyed all of Impel Down!"