There could be a mentor - like character in these fanfictions. This could be someone who has experience with cybernetic enhancements and helps the main character understand and master their cyborg tail. This character often has a lot of wisdom to offer and can be a fan favorite. Additionally, antagonists who try to steal or misuse the technology of the cyborg tail can also be popular as they create conflict in the story.
Often, the main character who has the cyborg tail is quite popular. They are usually the focus of the story as they navigate their new abilities and the challenges that come with having a cyborg tail. There might also be the scientist or inventor who created the cyborg tail, if the story delves into the backstory of how the tail came to be.
Naruto himself is obviously a very popular character in this type of fanfiction, given that it's about a 'naruto cyborg ninja'. Sasuke could also be a popular character, perhaps as an adversary or an ally to the cyborg Naruto, depending on the plot.
Often, characters like kitsunes (fox spirits) are popular. Their tails are not only a significant part of their appearance but also can be a source of interesting tickle - related scenarios. For example, a kitsune might be tricked into a tickle fight by a rival spirit who targets its bushy tail.
Naruto himself is often a central character in these fanfictions. Given his connection to the Nine - Tails, his interaction with the Ten - Tails is a popular theme. Sasuke is also quite common as he is Naruto's rival and his power and motives can be intertwined with the power of the Ten - Tails.
The bunny is another favorite. With its little cotton - ball - like tail, it's often portrayed as a timid but kind character. In many stories, the bunny's tail might be a source of comfort for other characters or it could be used to signal danger when it thumps on the ground.
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.
Sonic is a popular choice. He and Tails are best friends, so it makes sense for Sonic to show up in Tails' adventure. He could come to Tails' rescue or they could team up to face a common enemy.
Cyborg 009 himself is often very popular in fanfic. His leadership skills and powerful abilities make him a central figure. Cyborg 003 is also quite popular, especially in stories that focus on relationships or the more emotional side of the cyborgs. And Cyborg 001, with his mysterious powers and child - like appearance, often attracts a lot of attention in fan - created stories.
Well, the Nine - Tails itself can be considered a popular 'character' in this type of fanfiction. It has its own personality and power, and many stories revolve around Naruto's interaction with it. Another character that might be popular is Gaara. Since he also has a tailed beast within him, there could be interesting interactions between him and Naruto regarding their respective tailed beasts, especially when it comes to the Nine - Tails.
One interesting concept could be the enhanced abilities that the cyborg tails bring. For example, a character with a cyborg tail might have super strength in their tail movements, allowing them to perform acrobatic feats or even use it as a weapon in combat. Another concept could be the integration of the tail into the character's identity. It might be a source of pride or a mark of their unique status in the story's world.
Often, the main protagonist is quite popular. They are usually the ones driving the story forward and facing the most challenges.