Zexion, the Cloaked Schemer (影歩む策士 Kageayumu Sakushi?, lit. Shadow-Walking Schemer), is the Nobody of ienzo and is Rank VI in Organization XIII and an antagonist in Riku's storyline in Kingdom Hearts: Chain of Memories. He weaves illusions to fight for him. Unlike the other Organization members, Zexion's weapon was originally unknown, and his talents were used only outside of normal combat. In Kingdom Hearts Re:Chain of Memories, Zexion's weapon was revealed to be a book called a Lexicon.
Zexion appeared in Kingdom Hearts: Chain of Memories as a participant in the struggle within the Organization between the newer and veteran members. He is also central to the plot to use Riku as a puppet in Castle Oblivion. Zexion also appears in Kingdom Hearts 358/2 Days, as one of the playable characters in Mission Mode