She might have the ability to use the Rasengan in a new way, like infusing it with Byakugan - enhanced chakra control. This would make it more powerful and precise.
She could possess a power that allows her to communicate with animals like Naruto can with the toads. But instead of toads, she has a special connection with a unique species. Also, her Byakugan could have an upgraded version where she can not only see chakra points but also predict an opponent's next move more accurately than Hinata. This, combined with her own unique brand of Uzumaki - like tenacity, would make her a formidable ninja.
She could inherit Hinata's long, dark hair and Naruto's bright blue eyes. Her appearance might also be influenced by her personality. If she's more like Naruto, she might have a wilder look to her hair, and if she's more like Hinata, she'd have a more reserved and elegant appearance. Also, she might have Naruto's tan skin tone combined with Hinata's delicate features.
One possible name could be Hanabi, after Hinata's sister. It would be a sweet way to honor the family connection.
She could be a very powerful ninja. Maybe she inherits Naruto's stamina and Hinata's gentle yet strong Byakugan abilities. She might struggle with the high expectations that come with having such famous parents, but ultimately find her own path in the ninja world.
One idea could be that their daughter inherits Hinata's Byakugan and Naruto's determination. She could be training hard to become a great ninja, facing challenges like dealing with the high expectations of being the daughter of two such important figures. Maybe she struggles to find her own identity among all the attention.
She would probably have a big heart. Growing up in a family where her father is known for his love and friendship, and her mother for her kindness, she'd inherit those traits. In fanfiction, she could be shown using her kindness to make friends even with those who were initially her enemies. For example, if there was a new group of ninja from a far - off land that was initially hostile, she'd reach out to them and through her actions, change their views.
She is often portrayed as a strong - willed character. Since she has Naruto and Hinata as her parents, she inherits their best traits. For instance, she might have Naruto's determination and Hinata's kindness. In some fanfics, she's shown to be a natural at ninjutsu, quickly picking up new techniques.
She could have the power of the Nine - Tails like her father. Since Naruto has a strong connection with the Nine - Tails, it's possible that this power is passed down to his daughter. Maybe she can control the chakra of the Nine - Tails more easily and use it for powerful jutsu.
There are quite a few out there. Some focus on the daughter's adventures in the past, like how she uses her knowledge from the future to solve problems that her parents and their friends faced back then. For example, she might use her future - learned jutsu to help in a battle that was difficult in the original timeline. It's a great way to explore the Naruto universe from a different perspective.
She could have the power of wind manipulation like Temari. This would allow her to create powerful gusts of wind and use them for both offense and defense. Also, she might inherit Naruto's large chakra reserves, which would give her the stamina to perform complex jutsus for a long time.
Naruto's power in canon is mainly focused on physical combat and ninjutsu. As Poseidon's daughter, she could have the power to communicate with sea creatures. This would give her an edge in intelligence - gathering. She could send fish to spy on enemies in areas near water. Also, her strength could be enhanced when in contact with water, unlike in the original series where her power boost mainly came from the Nine - Tails chakra.