|This article is about a/an villain in Hyakujuu Sentai Gaoranger.|
Ultimate Org Hyakkimaru (究極オルグ百鬼丸, Kyūkyoku Orugu Hyakkimaru, Hundred Demon Complete, 23, 33, 37): Seen in flashbacks, Hyakkimaru is the Org that was responsible for destroying GaoGod one thousand years earlier before he himself was killed by GaoHunter, which was powered by Duke Org Rouki's evil energy. As its name indicates, Hyakkimaru was created by many Highness Duke Orgs joining together into a single form.
- Hyakkimaru is voiced by the late Seizō Katō, who had previously voiced Dai Satan from Kyoryu Sentai Zyuranger.
- In Hyakkimaru's concept art, the suit has similarities with Rakushaasa's.
- Ultimate Org Hyakkimaru was designed by character designer Yoshiro Harada.