Abraham is a non-epic and a member of the Reckoners, who was born in French Canada.
He is described as tall, burly, and black skinned, with a smooth French accent. He is also a firm believer of the Faithful, which is a group of people believing that there are good epics.
Not much is known about him, but he was ex-JTF2 which stands for Canadian Special Forces. He was high enough in the ranks to show his leadership skills (Presumed in the commissioned officers) but was being court-martialed at the time that one of the epics hit his team at Trenton, which resulted in them all being wiped out. He fights to avenge his former team.
He has also shown leadership skills, and as David noted, it should be him leading the team and not himself. He is the heavy weapons man on the team, and has limited medical skills.
In the ending of Calamity, it is noted that he got his arm cut off from one of Limelight's force fields, but Megan expects that he would heal, with the help of Prof's healing powers.