The Ninja Kaijin (忍術怪人,   Ninjutsu kaijin?) is a kaiju created by Toho that first appeared in episode 48 of Go! Greenman.


Ninja Kaijin looks like one of the Minions of Maoh, except his skin is white and he wears ninja outerwear such as a gappa and zukin.


Go! Greenman

Ninja Kaijin was the forty-ninth monster to battle Greenman. He was created by Tonchiki and sent to retrieve the blood of children for Maoh. The Ninja Kaijin and its creator began to terrorize the kids before two of them used their Green Calls and summoned Greenman to protect them. Eventually the hero came out victorious.


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