Indigo

One of the most mysterious of the Sovereign Seven. 'He' is an enigma, without a true identity; even the pronoun "he" is arbitrary. When he desires it, Indigo can go completely unnoticed. His presence simply is not registered, whether it's in a dark hallway or a crowded street. He is also the consummate persuader. He can convince almost anyone (or anything) to do what he wants. He is a master infiltrator, allowing him to get into and out of secure areas. He is also the Sovereigns' tactician, carrying out Cascade's orders no matter how difficult.