Imasa is the martial part in the big angry blue dragon and spellcaster trio. He is of neutral alignment and seems to be very faithful to his lady and thinks that all decent Dragonborn should stay in their role of servant. But if this is because of true devotion or because of fear of undead dragonborn paladins is not sure.
He is prone to cursing.
Imasa is most likely a Swordsage because of his use of a Dessert Wind maneuver to finish off a Slicing golem and a Shadow hand maneuver to teleport away, though he was caught in the Ytaran teleportation blocker and then caught by Angel and the rest of her entourage.
He also seems to be able to cast spells, though his Concentration was too bad that he was not able to do it while in a Chilling Fog.