Well, he would be super fast, for sure. He could zip around the battlefield so quickly that his enemies wouldn't be able to keep up. He might be able to use his new speed to perform his jutsu even more effectively, like hitting multiple targets in an instant with a Rasengan.
He would probably be extremely fast, able to move at speeds that would shock his opponents. His attacks would become more unpredictable as he could quickly close the gap between him and his enemies.
If Naruto were blessed by the speed force in a fanfic, it would completely change his fighting style. He could quickly close the gap between him and his foes, and his rasengan would be delivered in a blink of an eye. Also, his ability to gather information on the battlefield would be enhanced as he could zip around to different locations rapidly.
If Naruto got the Phoenix Force in fanfiction, his appearance might change a bit. Maybe he'd have some sort of fiery aura. His personality could also be affected. He might become more confident or even a bit more aggressive in battle. He could use the Phoenix Force to travel faster, too, like teleporting short distances.
Well, Naruto would become extremely fast. He could zip around the battlefield in an instant, catching his enemies off - guard. His combat style would change drastically as he could now close the distance between him and his foes before they could even react.
One possible fanfiction could involve Naruto being transported to the Young Justice universe and somehow getting connected to the Speed Force. Maybe he gains super - speed abilities and has to learn how to control them while also dealing with the threats in the Young Justice world. He could team up with the Young Justice characters, like Robin or Kid Flash, and use his ninja skills along with his new speed powers to take on villains.
Ruby would be a likely candidate. She's already known for her speed and agility in combat. If she were to be affected by the Speed Force, it would enhance her existing abilities to a whole new level. She could move so fast that she becomes almost invisible to her enemies, and her scythe attacks would be even more deadly with the added momentum.
He might become more confident in his abilities. With the speed force, he would have an edge in combat and could take on tougher opponents.
His life would be much busier. He'd be able to do more things in less time. For example, he could complete his missions faster and have more time to train or relax.
If Harry were to use the Force in fanfiction, it would be a game - changer. His relationships with his friends might change as they try to understand this new power of his. He could use the Force to explore hidden places that are protected by magic, finding new secrets. His enemies would be more afraid of him as he combines magic and the Force, making him a more formidable opponent. For instance, he could use the Force to break through powerful dark magic barriers that he couldn't with just magic.
He could gain new stealth abilities. Kikaichu are known for their ability to be discreet, so Naruto might be able to spy on enemies more effectively.