Deimos

Deimos is the leader of the Brotherhood cell based out of Chicago. He is Zombie's mentor.

Traveling Freakshow
Deimos ran a mutant fighting exhibition in the South, which is where a young Jane Meyers ran into him. He took her under his protection, trained her in fighting and how to best use her special ability. His girlfriend at the time was Phoebe, who fed off of the fear that he induced in people.

He grew fond of Jane, in his own way, and when Phoebe went too far, he took Jane with him and left. His best friend, Tar Man, also went with them.

Chicago
In Chicago he became the leader of the Brotherhood there, with Tar Man and Zombie as his main enforcers. When the opportunity came for new leadership for the Brotherhood on the West Coast, he recommended Zombie for the job.

Ability
Deimos has the ability to know what someone's worst fear is...and to show it to them. A limited psychic, he can basically lock a person, mutant or mundane, into a nightmare coma. A more limited use of his power would be to simply know what someone's fear is, and use that to manipulate them.