Another popular choice in fanfiction could be Sakura. Although in the official story she has a different relationship dynamic, in some fanfictions, the writers re - imagine her as Naruto's girlfriend, perhaps exploring different sides of their personalities and how they could interact romantically.
There are also some more unique fanfictions where an original character (OC) is Naruto's girlfriend. These OCs are often created to bring a fresh perspective and unique storylines to the Naruto universe, allowing for completely new relationship dynamics that aren't bound by the pre - existing story.
It could be Misty. They have a long - standing relationship in the Pokemon series. They've traveled together and shared many adventures, so in a fanfiction, it's not a stretch to imagine her as a secret girlfriend.
Sakura could potentially be Naruto's girlfriend in some fanfictions. Although in the original series she had feelings for Sasuke for a long time, in fan - created stories, the writers might explore a different path where she realizes Naruto's true worth and they end up together.
Perhaps it could be someone from his own village that he never really noticed before. Like a girl who was always in the background but during his time away, she grew into a confident and beautiful woman. She could be someone who works in the hospital, and Naruto starts to see her in a new light when he comes back injured from a mission.
It could be Hinata. In the Naruto series, Hinata has a long - standing admiration for Naruto. She's beautiful and kind - hearted, which would make her a great 'hot girlfriend' in the fanfic.
Hinata could be a great choice. In the original series, she has always had feelings for Naruto. In a fanfiction, they could finally get together more easily. Maybe after the war, Naruto realizes how much Hinata means to him and they start a relationship.
Another possibility is that it's a Pokémon in human form, which is a common trope in some fanfics. This Pokémon - turned - human could have fallen in love with Ash during their adventures together, and now they have to keep their relationship a secret from the world of Pokémon and humans alike.
One possible reason could be that she was forced to betray him. Maybe an enemy got to her family and threatened her to turn on Naruto. For example, in the Naruto universe, there are many powerful villains who would stoop to such tactics.
There are also some fanfictions where a completely new character is introduced as Naruto's secret girlfriend. This allows the writer to create a unique story line and explore different dynamics that are not bound by the pre - existing characters and relationships in the Naruto universe.
Another possibility is that his new girlfriend could be a reincarnation of an ancient ninja. She has memories of the past that she shares with Naruto, and through these shared experiences and her connection to the old ninja ways, they form a deep bond and start a romantic relationship.
In some fanfictions, it could be a character from another magical school. Like a girl from Beauxbatons or Durmstrang. She might have met Harry during an international magical event and they've been secretly seeing each other ever since.