Joker's main role was to report Kenshirō's latest activities to Shin and give orders to Shin's subordinate gangs on his behalf. He was a master illusionist, who also carried unlimited throwing cards which were strong enough to cut through stone. Joker also had a pet hawk, which could lift him away whenever he needed to escape.
When Balcom claimed that he and his men had successfully killed Kenshirō, Joker was dubious and visited the site of the battle to find Kenshirō's body. When Joker discovered that Kenshirō was indeed still alive and well, he challenged him to one final battle. Kenshirō outfoxed Joker and used the Hokuto Zankai Ken technique on him. Faced with being Kenshirō's messenger to Shin, Joker declined and chose death instead, promising to watch Kenshiro's fight with Shin from Hell.
- Joker seems to draw heavy inspiration from the Joker of the DC universe.
- The villain of the Celestial arc, Jakoh has several similarities. Much like Joker, he draws visual inspiration from Batman's archenemy and is voiced by Shigeru Chiba. However, unlike Joker who was a fearless martial artist with a firm sense of loyalty, Jakoh was a scheming coward without any fighting ability.
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