Grinsha

Grinsha appeared in 2014 TV series called Kamen Rider Gaim. Grinsha (グリンシャ Gurinsha) was one of the last survivors of the Femushinmu civilization, having been transformed into a white Over Lord Inves before slaughtering countless weaker members of his kind when his world was touched by the Helheim Forest.

He is summoned by Rosyuo to assist Redyue. Under Redyue's leadership, he is ordered to capture a civilian for a sacrifice. Apparently he found where Kouta's sister, Akira Kazuraba and the survivors are hiding. When he was about to be destroyed by Gaim Kiwami Arms and Baron Lemon Energy Arms, he is saved by Redyue and knocked unconscious. When Redyue leaves the scene, he woke up for another round with the two Armored Riders later. However, he was defeated at the hands of Gaim Kiwami Arms and Baron Lemon Energy Arms.

Grinsha is revived by Maja and helps subdue Kouta Kazuraba alongside his fellow Over Lords and the deceased, mind-controlled Armored Riders. When Kouta revives all of the fallen Armored Riders to his side, the battlefield becomes open warfare with the Riders, Maja, and the Over Lords all fighting. Fighting New Generation Riders Duke and Sigurd, Grinsha is soon enough destroyed again by their Lemon Energy Squash and Cherry Energy Squash respectively.

He is very loyal to Rosyuo and Redyue and obeys their orders without questions. Even though without knowing he was used by Redyue to testing Kamen Rider Gaim Kiwami Arms' power, he continue to obey Redyue's orders in order to fulfill Rosyuo's wish.

Powers and Abilities
Grinsha is shown to be far more powerful than Demushu and Dyudyuonshu, as he is equally matched with Gaim Kiwami Arms. Grinsha wields the Aashuimu (アアシュイム) sword as his main weapon. Alternately, he can attack with his horn at high speed.