What could be the possible backstory of Naruto's wolf partner in fanfiction?

One possible storyline could be that the female wolf partner has special powers. For example, she might be able to communicate with other animals in the Naruto world, which helps Naruto in his missions. Maybe she can sense danger from afar and warns Naruto in time.

In the fanfiction, a possible backstory could be that Naruto, after achieving great power and peace in his own time, decided to use his abilities to explore the past. During this exploration, he accidentally or purposefully got involved in the lives of his ancestors. He might have fallen in love with a woman from the Uzumaki clan in the past and had children. These children then passed on their genes through generations until Kushina was born. It could also be that there was some sort of experiment by an ancient shinobi that went wrong or right (depending on how you look at it). This experiment somehow connected Naruto's future self to be Kushina's grandfather by altering the fabric of time and family relations in a very strange way.

Maybe he had some bad experiences with weaklings who let him down in crucial moments. For example, a weak comrade could have failed to protect someone important, and that made Naruto start to dislike those he considered weak.

Maybe Nagato had a relationship with an Uzumaki woman before he became fully involved in the Akatsuki. This woman could have given birth to Naruto but for some reason, Naruto was separated from Nagato at a young age. It could be due to the chaos and danger that Nagato was getting into with his plans for the Akatsuki.

Perhaps in this fanfiction, Naruto travels back in time. He goes to a time when the world was being formed, and through his unique chakra, he gives birth to the Nine - tails. This could be part of a grand plan to ensure balance in the future ninja world, and he is the only one with the power to do so.

The female wolf partner could enhance Naruto's combat skills. She might be really fast and strong, and through sparring with her, Naruto becomes better at fighting. For example, she could teach Naruto some unique wolf - style combat moves.

Maybe he was attacked by a rogue ninja with a special weapon that damaged his eye. This would be a tragic event that could change his perspective on the ninja world and his role in it. The eyepatch would then be a constant reminder of that fateful encounter.

Maybe there was some sort of divine interference or prophecy. For instance, a prophecy foretold that a child of Artemis would be the key to saving the world from a great threat. So, the gods found a way to make it happen, despite Artemis' vow of chastity. It could also be that some dark magic forced Artemis into a situation where she had to bear a child, and that child was Percy.

In some fanfictions, Erza's father could be a powerful mage who was lost in a great battle against dark forces. His absence then becomes a driving force for Erza's growth and her determination to fight evil.

Some possible names could be 'Fang' as it's a simple and common name for a wolf in many stories. It gives the idea of the wolf's fierceness.