Ichigo is one of the main characters. He's a human who becomes a Soul Reaper. Rukia is also important. She's the Soul Reaper who gives Ichigo his powers.
Most likely, Ichigo Kurosaki would be one of the main characters. He is the central figure in the 'Bleach' franchise. Rukia Kuchiki might also be a main character as she is crucial to the story's start in the original series.
I assume the main characters would be the ones from the original Bleach series like Ichigo Kurosaki. He was the central figure in the anime and manga, so it's likely he plays an important role in the novel as well.
The main character is Ichigo Kurosaki. He is the substitute Soul Reaper. Rukia Kuchiki is also a key character as she is the one who initially gives Ichigo his powers. There's also Orihime Inoue, Ichigo's classmate and later an important ally with her unique healing and offensive abilities. Uryu Ishida, a Quincy, is another main character. And in Soul Society, Byakuya Kuchiki, a high - ranking Soul Reaper, is quite prominent.
There's also Uryu Ishida. He's a Quincy, which is a different type of spiritual being. His skills and his relationship with Ichigo add a lot to the story. And then there's Aizen Sosuke, a complex and powerful antagonist who has his own grand plans that drive much of the plot.
Ichigo would probably be one of the main characters. He's the protagonist of Bleach, so it makes sense for him to be at the sleepover. Rukia might also be there, as she has a close relationship with Ichigo. And Uryu could be there too, since he's another important character in the series.
Perhaps one character could be a die - hard 'bleach' fan who is really good at the quiz. And the other character could be someone new to the 'bleach' world but is attracted to the first character's knowledge and passion during the quiz. So these two could be the main characters in this 'bleach quiz love story'.
The main characters in the 'bleach hell arc novel' are Ichigo, the main protagonist with his strong will and great power. He is the one who drives the story forward in Hell. Rukia, his friend and fellow Soul Reaper, is by his side. Her experience and wisdom are valuable assets. Chad, who has a physical strength that is very useful in combat situations. Orihime, whose powers of rejection and healing are crucial. Uryu, as a Quincy, brings his own set of skills and knowledge. And there are also other characters from the Soul Society who may show up and play important roles in the events that unfold in Hell. Their combined efforts and relationships form the core of the story in this arc.
Typically, in a fanfic that combines Naruto and Bleach elements and involves immortality, you would expect to see Naruto Uzumaki. He is a central character in Naruto and his story could take a whole new turn with immortality. Also, Ichigo Kurosaki from Bleach would probably be there. His unique powers and his journey could be greatly affected by the concept of immortality. There might also be other important characters from both series, like Sasuke from Naruto or Rukia from Bleach, who play important roles in the new narrative of the fanfic.