Raul is Navarro's premier Vertibird mechanic in 2241, walking around in a permanently filthy military uniform, covered in grease spots. He has a characteristic attitude, speaking about himself in third person and an unhealthy obsession about keeping Vertibirds in top shape, disliking even qualified Enclave pilots' operation of his babies.
Raul has a long running rivalry with the head of the mechanics, Quincy, to the point that even the slightest bad remark about him results in a fistfight in the mechanics' garage. He also takes care of Dr. Schreber's electric motor that was taken out of the doctor's robot, K-9.
Fix K-9: While looking for K-9's repair parts, if you tell Quincy in the North-East hangar that Raul sent you for the plans, there will be a dialogue option for you to tell Raul that Quincy wants to see him, whereupon he walks off to beat him up, leaving you free to retrieve the K-9 motivator.