Zexion

Zexion, the Cloaked Schemer, is number VI in Organization XIII, and the youngest of the original six members. He appeared in Kingdom Hearts:Chain of Memories as a participant in the struggle within the Organization between the newer and veteran members. He was also central to the plot to use Riku as a puppet in Castle Oblivion.

Unlike the other Organization members, Zexion's weapon is unknown, and his talents lie outside of normal combat.

Discovering Riku

After Sora had been lured into Castle Oblivion, Zexion discovered another scent deep in the dungeons of the castle. Originally, he mistook the scent to be that of "The Superior", an (at the time) unnamed entity within the Organization. Eventually, however, Zexion and his cohorts determined that the scent belonged to Riku, who had appeared in the Castle by force of will after Sora arrived. Vexen hypothesized that the darkness in Riku's heart had caused Zexion to mistake him for "the Superior" (Xemnas), calling the effect "fascinating". Specifically, Riku's heart was plagued by the presence of Ansem, Seeker of Darkness. The relationship they shared was that "Ansem" and Xemnas both originated from Xehanort; "Ansem" was Xehanort's Heartless, and Xemnas was his Nobody.

Opposition to Marluxia

Zexion, as well as Lexaeus and Vexen, came to see that Marluxia, keeper of Castle Oblivion, intended to take control of Organization XIII, with the help of Larxene. They decided to oppose the plot by having Vexen investigate