Naruto Uzumaki: The Ultimate Ninja and the student of Jiraiya and Ryu Hayabusa who wields the powers of all 9 tailed beasts and then some. Naruto, 16, is done saving the world from Kaguya, he returned Sasuke to the good side, there's peace between the ninja nations, and he got a girlfriend. He's free to do whatever he wants. He can go wherever he wants to go. There's nothing holding him back. However, Viola tells him that while he is free from his destiny, his life is still part of a bigger picture, he just doesn't know how big it is. That sort of thing bothers him, but at the same time, admits that something like that will make his life interesting. Naruto's abilities will be limited due to the need to avoid collateral damage and prevent unnecessary casualties. (Note: Naruto does not have an artificial arm since he has high regenerative abilities)
Ichigo Kurosaki: When Ichigo enters the story, you will find his Soul Reaper powers fluctuating a bit as a result of his fight with Aizen. He's right now making every day count. He's dating Orihime, and he has a job as a pizza delivery boy before working for Ikumi. Due to only fighting Hollows, defected Soul Reapers, Bounts, and Arrancars, he is ignorant of other threats outside of Karakura Town. While he's unprepared to fight someone like Naruto, he has the fortitude to fight Naruto, as well as the supernatural abilities to compete on some level with The Ultimate Ninja and give him a hard time. When he meets Naruto, he sees him standing over a defeated Ūryu.
Moka Akashiya: Naruto v Bleach takes place during Rosario + Vampire: Universe 458 Part II. She had just finished catching up with her friend Naruto some time ago, who, despite liking Tsukune, still harbors feelings for Naruto. When Naruto, Ichigo, and Moka come together to fight the big bad guy, Naruto will be in his Six Path Sage Mode, which will make him unrecognizable to Moka, but at the same time, Naruto doesn't know that Inner Moka is Moka(Note: Both are unaware of the other's double life). Moka still wears the orange scarf that Naruto gave her over a year ago. Following Part I, Moka now has the ability to freeze her own body parts and transfer this over to other objects or beings, freezing the blood in her opponent's body as well as pressurizing liquid in her eyeballs and then creating small openings in her pupils, eventually creating two fluid jets powerful enough to slice steel and flesh.
Sōsuke Aizen: Aizen is relevant to the plot since he's the one who created the main antagonist for Heroes United. He makes a short appearance when Ichigo comes to him for answers on what Naruto is, whom Aizen is unaware of but uses that as a way to play a trick on Ichigo.
Orihime Inoue: Orihime is the same girl we all know and love. Now that she's with Ichigo, she's on cloud nine. But, by being the orange-haired Soul Reaper's love interest, she ends up being caught in the middle of Naruto and Ichigo's fight.
Uryū Ishida: Uryū will appear at the beginning of the story, having been defeated by Naruto after falling victim to the creation's abilities. Uryū's defeat is what causes Ichigo to see Naruto as a threat, not knowing that Uryū wasn't being himself.
Yasutora Sado: Sado will appear at some point in the story, having been defeated and left half-dead by Aizen's creation.
Abareru: The main antagonist of the story. Abareru is an Arrancar created by Aizen who not only possesses abilities that surpass even the Gotei 13, but has an insane power that makes him "one tough son of a bitch." Abareru is 7 foot 6 inches tall humanoid hound with white skin and black fur as well as a hole in the chest. Its mask takes the form of a vicious dog with long-curved horns and glowing red eyes. Abareru's main weapons are its claws, its fists, and its devastating Rabia Cero.