|Affiliation||Lord Mei-Oh (former)|
|First Appearance||Tenchu: Stealth Assassins|
Onikage was once a ninja that went by the name of Suzaku (朱雀), the Red Sparrow. He pretended to be blind by wearing a black blindfold, and served Lady Kagami as a Lord of the Burning Dawn. He murdered his lover, Yukihotaru, after she was defeated by Rikimaru at the Buddhist Temple, stating that he had "no love for weakness, only power." Later Rikimaru defeated him in a second large ship before he fought against Lady Kagami.
Onikage assisted Mei-Oh in coming to Earth. Rikimaru fought him during this time, unaware that he and Suzaku were the same person. Onikage never revealed his former identity to him for unknown reasons. Rikimaru killed both Onikage and Mei-Oh.
Onikage was brought back to life by a sorcerer named Tenrai. He then served him while secretly making plans to bring back his true master, Mei-Oh. After Rikimaru killed Tenrai, Onikage informed the spirit of Mei-Oh that his time to return was at hand.
Three years later, Onikage returns and assumes the identity of Naotada Sekiya, Lord Gohda's longtime advisor. Assisted by a woman named Rinshi, they begin an elaborate plot to lead the clan into thinking a war is brewing. This eventually leads to Rikimaru being marked as traitor. He seized the castle and burned it while Rikimaru and Ayame were led to different places.
Onikage calls upon the forces of darkness, granting him many arcane abilities. In Tenchu: Stealth Assassins, and Tenchu: Wrath of Heaven, he fights bare-handed, using fast and powerful Tae Kwon Do-like kicks. As the Red Sparrow in Birth of the Stealth Assassins, he uses the same Tae Kwon Do style combined to a chinese Jian sword.
- His name means Demon Shadow Oni (Demon) Kage (Shadow), which makes sense considering he served under Lord Mei-Oh.