The commanders of the armies in Maurice do not have any traits.
Instead it has notables who have traits. They can act as the commander of a force and give their traits to the unit or force they are with. Some improve scouting, work with cavalry, some only work with irregulars, some improve shooting or hand to hand combat. The traits are more limited than those in Longstreet.
In a campaign each side starts with a randomly chosen notable, others may be attracted to armies based on the epic points they win in a battle, they can retire after each battle or be sacked, and killed in hand to hand combat.