His combat style might change significantly. Since he can control blood, he could use it to immobilize his foes. For example, he could clot the blood in their legs, making them unable to move. Also, he could detect the presence of enemies by sensing their blood flow. This ability would give him an edge in surprise attacks and in tracking down opponents who are trying to hide.
Well, if Naruto can control blood in fanfiction, his combat style could become more insidious. He could potentially manipulate the blood of his opponents from within their bodies, causing them internal harm without them realizing it immediately. This would add a stealthy and deadly aspect to his fighting, as it's not a direct and obvious form of attack like his regular jutsus.
If Naruto can control blood in the fanfiction, his combat style would be revolutionized. He could start battles in a very unexpected way. He might be able to draw blood from a small cut on his own body and then use it as a weapon, shaping it into sharp objects or using it to bind his enemies. Moreover, he could use his control over blood to heal himself more effectively. By manipulating his own blood circulation, he could speed up the healing process of his wounds, which would make him more durable in combat.