Maraas ("Nothing" in the Qunari language) is a Tal-Vashoth mercenary of the kossith race, first encountered on The Wounded Coast. The Champion can convince him to turn against the other renegade Qunari. He later appears in the Hanged Man during Act 3. He will not work for The Champion, because he prefers simple jobs to those with causes.
Bugs
His conversation will claim that Hawke convinced him to fight against the other Tal-Vashoth (dialogue option available only to an aggressive Hawke during the quest Blackpowder Promise on The Wounded Coast) even if that was not the case. This remains the same regardless of whether or not you chose such options during your dialogue with him.