He would likely have enhanced strength. Just like how he could already overpower many foes in the Naruto series, as a god dragon slayer, his physical strength could increase exponentially. He might be able to break through the toughest of dragon scales with his bare hands.
As a god dragon slayer, Naruto may possess the ability to communicate with dragons. This would give him an edge in battles as he could understand their strategies and motives. He could also gain the power of flight, either by sprouting dragon wings or using some form of dragon - based chakra to levitate. His already existing shadow clone technique could be enhanced, allowing his clones to also have some of the dragon - slayer abilities, multiplying his effectiveness in combat.
It's also likely that Naruto becomes a god dragon slayer as a result of a prophecy. The fanfiction could explore how he initially struggles with this new role. He has to deal with the expectations that come with being a 'god' - level dragon slayer. Along the way, he might make new allies, like other dragon slayers or magical creatures who recognize his potential and help him in his journey to master this new power.
One interesting concept could be the unique powers that a character might gain to slay the dragon god. For example, they might combine Naruto's existing ninja techniques with new dragon - slaying abilities. Maybe they could use shadow clones to distract the dragon god while using a special jutsu to attack its weak points.
He might have the power of instant teleportation. Just like a god can appear anywhere, Naruto could do the same to surprise his enemies or reach his friends in need quickly.
He would likely gain enhanced physical abilities. Dragons are often depicted as extremely strong and fast, so Naruto as a Dragon Sage might have superhuman strength and speed. For example, he could move at blurring speeds and deliver powerful punches and kicks that could cause massive destruction.
He'd be extremely powerful. Naruto already has a lot of chakra and strong ninja skills. Adding dragon slayer magic would give him new ways to attack and defend. For instance, he could use fire dragon slayer magic to enhance his fire - based jutsus.
The character's moral compass could also shift. Let's say a Naruto character who becomes a lava dragon slayer starts using their power for revenge at first. But as they face the consequences of their actions and see the harm they cause, they realize the error of their ways. They then start to use their power to protect and uphold justice. This change in their values would be a significant part of their character development, as they go from being self - centered to being more selfless and heroic.
The dragon god itself could be the main antagonist. Given its power and the threat it poses to the Naruto universe, it would be a natural choice. It could be a being that wants to destroy the ninja world or enslave it for its own purposes.
In the 'naruto is dragon in academy youkai fanfiction', Naruto as a dragon would likely have a range of powers. He could have the ability to breathe different elements like fire, ice, or lightning, depending on the nature of the fanfiction. His physical strength would be extraordinary, enabling him to lift heavy objects or break through barriers with ease. He might also have some form of magical or youkai - related powers, such as the ability to sense other youkai or to use his dragon form to enter hidden or magical realms within the academy.
In this fanfiction, Naruto could possess the power of regeneration. Dragons are often depicted as having strong regenerative abilities. So, if Naruto gets injured in battle, he might be able to heal himself much faster than before. Additionally, he could have the ability to sense things from a great distance, like a dragon can detect prey or danger from afar. His senses of sight, smell, and hearing could be greatly enhanced, allowing him to be more aware of his surroundings and better anticipate attacks.
Sasuke would be really interesting. He already has a dark and brooding nature. Adding Ice Devil Slayer powers would enhance his cool and aloof demeanor. He could use the ice powers in combination with his Sharingan and fire - based jutsu in really unique ways. For example, he could freeze the water created by a water - style jutsu and then shatter it with his ice powers.