Naruto himself is often a popular character in such fanfiction. Writers like to explore how he would interact with the concept of a force user, perhaps learning from them or even becoming one himself in some alternate storylines.
Kakashi could be popular too. His wisdom and combat experience would be valuable in guiding or training force users. Also, his sharingan could potentially have some unforeseen interactions with the force, which makes for an exciting plot point in fanfiction.
One popular character is Alex, an OC in a fanfiction where he uses a unique force to fight crime in Gotham. He has a tragic backstory which makes him relatable and his force powers are a blend of telekinesis and energy manipulation. Another is Lily, whose force - based abilities allow her to communicate with animals in the DC universe. She often teams up with Batman to solve cases that involve animal - related mysteries.
Sasuke is also very popular. His complex character, with his dark past and powerful abilities, gives a lot of room for interesting plot developments in fanfiction. Writers can explore his relationships with other characters in the Blitz Force setting more deeply.
Naruto himself is often very popular. Since he's the main character in the original Naruto series, it's natural that fans like to see him with stand abilities. Sasuke is also a favorite. His cool and brooding nature combined with stand powers can make for some exciting storylines.
Sasuke is also a likely popular character in such fanfiction. His natural talent and thirst for power make it interesting to see how he would interact with the jinton. Maybe he would seek to steal the knowledge of the jinton from someone or be in a rivalry with another character who uses it.
Naruto is obviously a very popular character in these fanfictions as the series is named after him. He is often the central figure in stories that involve Ki. Another popular character is Sasuke. His natural talent and brooding nature make him a great candidate to either be an ally or a rival in stories that incorporate Ki. Kakashi is also popular, as his wisdom and experience can be used to guide characters in understanding and using Ki.
In Naruto bug user fanfiction, Shino Aburame is often a popular character. Since his clan already has a strong connection with bugs, fanfiction writers like to explore his character further. They might give him new bug - related abilities or put him in unique situations where his bug skills are put to the test in different ways.
Sasuke could be a popular character in such fanfictions. His natural combat skills and his drive for power would make him an interesting character to be paired with a gun. He could use his Sharingan to enhance his aiming and reaction time when using a gun.
Darth Vader is also a favorite. His complex relationship with the Force, being both a powerful Sith and once a Jedi, offers a lot of room for creative exploration in fanfiction. Maybe in some stories, he has a different redemption arc due to some unique'magic of the force' element.
Often, original characters created by fanfiction writers are the popular Grey Force users. They can be designed to have unique personalities and backstories that make them stand out.
Spectra is often a popular choice. His complex character, being an antagonist with his own motives and backstory, offers a lot of room for exploration in fanfiction. Writers can delve into his past, what made him turn against the Battle Force 5, and maybe even explore a redemption arc for him.