Anti M is an Exile that is a member of the Element, which were part of a larger program. She is described as a stylish and a sharp business woman, where she wears fancy Italian suits. Glad that she is does not have to be dictated to by Argon, she is one of the few Elements that relished the freedom of becoming an Exile and became a dealer of information.
She is romantically connected to Beryl, who was also closely linked to Argon in the hope of bringing her former boss down. However, it was discovered to have been authentic, and she was satisfied that she was having the affair under Argon's nose.
Not much of her former purpose was known, but it could be speculated that it would have involved with the dealing information (like communicating or transferring data).