One possible power for Naruto as a descendant of a god in fanfiction is the ability to communicate with all living things. This would give him an edge in gathering information and in forming alliances. He could also have a special form of chakra that is far more potent than regular chakra, enabling him to perform jutsus that are otherwise impossible.
One possible power is enhanced speed. Sparda is known for his agility in combat, and Naruto as his descendant in fanfiction could inherit this. He would be able to move so fast that his opponents could barely keep up. Another power could be the ability to manipulate demonic energy in a way similar to how he manipulates chakra. This could give him new jutsu - like abilities, for example, creating energy blasts with demonic properties. He might also inherit Sparda's resistance to certain types of attacks, like magic or dark energy attacks that are common in the Devil May Cry universe.
He could potentially have the ability to control the moisture in the air, creating sudden fogs to disorient opponents. And his water body might be able to split into multiple smaller water clones that are more fluid and harder to destroy compared to normal clones. Since water can take any shape, he could morph his body parts into weapons like water blades.
The 0 - Tailed Jirakin might possess the ability to manipulate space - time on a small scale. It could create mini - rifts or pockets of distorted space - time around it. Enemies getting too close could find themselves in a time - loop of sorts, repeating a small moment over and over until they break free, which would be extremely difficult as they'd be disoriented and unable to effectively attack the Jirakin.
In some fanfictions, Naruto Shiki might possess the power to manipulate shadow elements in extremely unique ways. For example, he could use his shadow to not only mimic the movements of others but also to create shadow constructs that can be used in combat, like shadow swords or shields.
One possible power could be instant teleportation within a certain range. Some sage - like abilities in Naruto involve quick movement between spaces. Naruto, as a born sage, could use this to surprise his enemies in battle. He could suddenly appear behind an opponent or quickly move to a strategic location, giving him an edge in combat.
Naruto has his powerful chakra and his ability to use shadow clones. Shippo can transform into different things. They could combine these powers in really interesting ways. For example, Shippo could transform into Naruto's shadow clones to create a more diverse and confusing attack for their enemies. Or Naruto could use his chakra to enhance Shippo's transformation abilities, making them more powerful and longer - lasting.
He could gain the power of controlling water like Poseidon's kids since he has good chakra control. It would be a new addition to his skill set.
He could have the power of instant regeneration. So, no matter how severe the injury, Naruto could heal himself in a split second. This would make him extremely difficult to defeat in combat.
Naruto could gain the power of mind control, similar to how Sauron could influence the minds of others. This would be a huge change for Naruto as he is usually all about friendship and persuasion through positive means. Now, he would have to struggle with this new power that goes against his normal moral code and figure out how to use it for good, if possible.
The baby might inherit Naruto's ability to use the Nine - Tails' chakra. Since Naruto has a strong connection with the Nine - Tails, it's possible for the baby to have some form of access to that power. This could manifest as enhanced strength and speed, similar to when Naruto taps into the Nine - Tails' chakra.