One advantage is better defense. He can quickly grow thick bushes or tall trees to shield himself or his allies from attacks. For example, in a battle against powerful ninjas, he can create a forest around them for protection.
It gives him an edge in stealth. He can use plants to camouflage himself. He could make vines cover his body and blend in with the surrounding foliage, making it hard for enemies to detect him. Also, plants can act as spies. He can control small plants to observe an area without being noticed.
It could also have implications for the Hulk himself. Usually, the Hulk is a wild and uncontrollable force. But with Naruto in control, he might be able to be used in more positive ways. The Hulk could be directed to help rebuild instead of just destroy. And from a character development perspective, the Hulk might learn to control his rage better under Naruto's influence, and Naruto might learn new things about power and responsibility from having to control such a powerful being.
Speed. Wolves are known for their speed, and Naruto in wolf form could move much faster than in his normal human form. This would be a great advantage in chasing enemies or getting to a location quickly.
Well, in some fanfictions, Naruto might have a special chakra ability related to nature that allows him to communicate with plants on a spiritual level. This connection enables him to command them to grow, move, or even use them as a form of defense or attack. For example, he could make vines entangle his enemies or have large trees block incoming attacks.
A possible drawback is that it might require a great deal of concentration. Naruto is already dealing with a lot in combat, like using his various jutsu and strategizing. Adding blood control to the mix might overtax his mental resources, making him vulnerable to attacks. Also, if his enemies figure out his new ability, they could try to counter it by using techniques that disrupt blood - related manipulation, like creating strong chakra fields around their bodies to prevent him from accessing their blood.
On the positive side, he can use it to protect Hogwarts. He could be like a living, breathing firewall against any fire - related attacks on the school. For instance, if the Dark Lord tries to set the castle ablaze, Harry can use his fire - controlling ability to counteract the flames and keep the students safe.
One implication is the moral dilemma. Percy would have to decide when and how to use such a powerful and invasive ability.
Well, in fanfiction, Naruto being trained in different ways can bring more variety to his character. He can be trained in unique fighting styles or gain knowledge that was not available in the original story. This can make him more versatile in different storylines. Also, it can attract more readers who are looking for new and exciting takes on Naruto's development.
He might also face moral dilemmas. For instance, using this power to heal someone might seem noble, but if he uses it to harm or manipulate others, it would be a different story. He has to constantly struggle with the right way to use this power.
One consequence could be that the wizarding world starts to view him with even more suspicion and fear. People are already afraid of dementors, and if Harry can control them, they might think he's becoming too powerful or even turning to the dark side.
He could use it for various things. For example, he could create barriers of water to protect himself or others. He might also be able to manipulate the flow of liquids in a chemical experiment in the fanfiction world, leading to new discoveries. Another application could be in firefighting, where he can control any liquid and use it to extinguish fires more effectively.