Kienji

Kienji is Kiro's younger brother and one of the targets in Sift Heads 4 and a playable character in Sift Renegade 3: Defiance. Kienji was born in 1988 in Tokyo, Japan.

Sift Renegade 3 and Sift Heads 4
Before Kienji's death, Kiro trained him to become a member of the Yakuza. But when he found out that Yuuma and other members of the Yakuza were making deals with the Triads he lead a revolt with other younger members against them, but before he did, he was killed by Vinnie ordered by Yuuma.

Being Avenged
When Kiro was saving Shawn he found out that the Triads killed Kienji, therefore starting to kill every Triad by anger. When he found out they hired Vinnie, he attempted to kidnap Shorty to lure him but was defeated, but Vinnie lets Kiro live and tell him to kill those who had hired him instead. When Kiro killed the Triad Leader and joined Vinnie, Kienji's Death was truly avenged by kill Yumma for hired Vinnie to kill Kienji.

Trivia

 * In Sift Renegade 3: Defiance, Kienji is seen holding a Naginata, and Shigeru and Shawn are seen with their Katanas.