The companion Mathis Castillo can be recruited during the crimson fleet questline if you choose to side with him during the prison mission.
Mathis Castillo
Skills
Weight Lifting
Weight training can significantly increase one's ability to carry weapons and equipment, both in space and on the ground.
Ballistics
Centuries of conflict have proven that when it comes to threat elimination, few things stack up to the reliable power of high-speed projectiles.
Incapacitation
EM weapons are generally employed to damage robots, but can also be used to render human beings unconscious.