Kamen Rider Leangle (Decade)

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.