Shiki is an ambitious man with a strong desire to rule the world, often appearing very carefree and comical. He takes on most things with a cheerful smile, and even getting a rudder stuck in his head, losing half his pirate fleet to Roger, or having his legs cut off didn't put him off much.Instead of using more conventional prosthesis after cutting off his own legs to escape Impel Down, he uses his own swords as prosthetic legs, which he openly shows