KingZero (キングゼロ Kingu Zero?, 22) is a giant blue-bird monster, King Zero's trademark Death Storm attack produces strong winds can all it to counter the attacks of KenRiser and NinRiser, with the only Genseishin able to fight it being JuuRiser. Crashing near Tokyo Tower, King Zero begins its attack as Demon Knight holds Gant at bay so the monster can battle the other Justirisers in KenRiser. After managing to drive Demon Knight away, Gant joins the battle and JuuRiser manages to overcome King Zero's barrier and destroys it with Thunder Burst while it attempted to escape.

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