Filled with whimsy, delicacy, and cruelty, he was also said to be the youngest mafioso closest to becoming a Port Mafia executive. However, he sometimes tended to be fickle and fastidious, hence missing his deadlines by months if his crafted supernotes—counterfeit money—failed to meet his standards. Nevertheless, Piano Man was quite trusted by Mafia boss Ōgai Mori to monitor Chūya Nakahara in case the latter attempted to betray the organization after being recruited from the Sheep.