Shinmugurun is a green Overlord Inves and a minor antagonist in Kamen Rider Gaim.
Shinmugurun was assigned by Redyue to assist Mitsuzane Kureshima in his mission to kidnap Mai. He threatened Peko unless Mai accompanied them back, causing her to go with them so Peko would be spared. However, Kouta and Kaito overhear the incident from a microphone they placed and go to see what happened, learning from Peko what happened. The two Riders try to save Mai, but are held off by Mitsuzane as Zangetsu Shin while Shinmugurun took Mai away.
He later fought Kamen Riders Duke and Gaim as they were making their way through the Yggdrasill headquarters and was destroyed by Gaim Kiwami Arms.