In addition to the fox, there could be a human character who stumbles upon the fox's world. This human could either be a friend or a foe to the fox. They might try to study the fox or, on the other hand, try to protect it from other threats in the fanfiction's universe.
There might also be a mentor - like figure who has an even more magnificent giant tail. This character helps the protagonist understand and master their own tail's abilities. They are respected and their knowledge about the tails is highly valued in the fanfiction world.
There could be stories where the giant - tailed fox discovers some hidden powers within itself. It could be a power to communicate with plants or control the elements. This new - found power then leads it on a journey to understand its true purpose in the world of the fanfiction.
Another possibility is that there is a group of anti - jinchuriki people who see Naruto as a threat because of his connection to the giant fox. They might try to kill Naruto to get rid of the 'giant fox problem'. Their leader could be the main antagonist, someone who has a deep - seated hatred for anything related to the tailed beasts.
Well, clearly Tails and Wave are the main characters. Tails, with his intelligence and mechanical know - how, and Wave, known for her speed and agility.
I'm not sure specifically as it depends on how the fanfiction author has developed the story. But it's likely that some of the main characters from the original Uzumaki story would still play important roles. For example, characters like Uzumaki Naruto or Uzumaki Kushina might be central figures, as they are iconic in the Uzumaki clan.
The main characters are, of course, Tails and Shadow. Tails is known for his intelligence and mechanical skills. He is a fox with two tails which he can use to fly. Shadow, on the other hand, is a powerful and often brooding character with super - speed and strength.
Obviously, Tails himself is the central character. Sonic is very likely to be involved as well, either as someone who tries to help Tails after he's hurt or as a factor in the situation that led to Tails' injury. Dr. Eggman could also be a key character, perhaps as the one who caused Tails' hurt in the first place.
Sonic is often paired with Tails. Their friendship in other Sonic canons carries over, and in Sonic Underground fanfiction, they might have new adventures together. Sonic's speed and Tails' smarts make them a great team.
Since it's a crossover fanfiction, Yhorm the Giant is surely one of the main characters. But it's hard to say who else without reading it. It could be characters from the original world of Yhorm and characters from the world he crosses into.
Well, clearly Tails and Honey are the main characters. Tails might be a cat with a unique tail feature that gives him some special abilities, like being able to balance really well or use his tail as a tool. Honey could be a sweet - natured cat, perhaps with a beautiful coat that is the envy of other cats in the story.