Mutsuki Kuroba

For the Original Kamen Rider Leangle, see Mutsuki Kamijo

Fictional character biography
Mutsuki Kuroba is an employee of BOARD, originally Rank King but recently promoted to an Ace who has the ability to transform into Kamen Rider Leangle with the sealed Spider Undead. After he is promoted to Ace and Kazuma is demoted, he starts treating him badly while developing a superiority complex. Mutsuki is the last Rider to lose his Rider System along with Hishigata, learning of Chalice's true identity as he and Hishigata have their life energy used by Hajime to create the Joker card. Leangle later appears in the World of the Rider War, though it is unclear whether Kuroba survived the incident in his World, or if a new Leangle was chosen. This Leangle was killed by Wataru, grief-stricken over the death of Rising IXA.

Transformations
Mutsuki possesses some of the same equipment used within the original Leangle system was developed through tricks and manipulation by Isaka, the Peacock Undead, who needed the sealed Spider Undead to complete it. However, as later revealed, the Undead was not sealed properly and thus manipulated his users for his own agenda. For Mutsuki to change into Leangle, he has to insert the sealed Category Ace of Clubs (Change Spider) card into his Leangle Buckle and position his buckle in front of his waist. The belt would then expand automatically around his waist. Mutsuki makes a motion with his right hand across his face and says "Henshin!" and opens a portion of his buckle. The buckle would announce "Open Up!" at this point. This would also cause a violet projection with a spider image to come out before him. Unlike Blade and Garren's method of transformation (running into their projections), Mutsuki's projection comes to him. This will complete the transformation into Leangle