Seemingly a sailor who is amnesiac about all details of his personal life. For some reason he has 4 testicles.
The real identity of this character is unknown. The second chapter stated that the Jojolion protagonist's name could be Yoshikage Kira, however it is later revealed that he is merely a doppelganger for the real Kira. He was later given the name Jousuke by the Higashikata family, who took him in.