Gaara. Since he has experience with being imprisoned himself, he could offer valuable advice. His sand powers could also be used to create distractions or protect Naruto during the escape.
Sakura could use her medical ninjutsu to heal Naruto if he gets injured during the escape and also use her strength to fight off guards. She might also have some knowledge about the prison from her studies.
Kakashi. He is very resourceful and could come up with a clever plan for Naruto's escape. His Sharingan could also be useful for seeing through any illusions or traps in the prison.
He could use his transformation jutsu. He could transform into a guard or an inmate who has access to the prison exit areas. Then he could just walk out when the opportunity arises.
It could be the warden of the Blood Prison. He might be a corrupt figure who is using the prison for his own gain. He sees Naruto as a threat to his operations and tries to keep him locked up at all costs.
It could be one of the powerful and corrupt prison guards. They might have their own hidden agendas and see Naruto as a threat to their power or secrets within the Blood Prison. So, they start a scheme to make it seem like Naruto has betrayed everyone.
The warden of the Blood Prison could be the main antagonist. He might be a power - hungry and corrupt individual who sees Naruto as a threat to his control over the prison. So, he devises plans to get rid of Naruto, which ultimately lead to Naruto's death.
Might be one of the powerful guards who has a grudge against Naruto for some reason. Maybe he believes Naruto is a threat to the order in the prison and tries to get rid of him secretly.
Naruto himself could be a likely main character. Given his determination and his ability to make friends, it would be interesting to see him in a harem situation within the Blood Prison. He could use his ninja skills to protect the harem members and try to break free from the prison's mysteries.
Perhaps there is a powerful and mysterious figure lurking in the shadows of the Blood Prison. This character has a vendetta against Naruto and uses the prison's environment and its inmates to try and bring Naruto down.
Well, one possibility could be that Naruto is framed for a crime he didn't commit and sent to the Blood Prison. There, he might face all kinds of dangerous inmates and tough prison guards. He would probably try to prove his innocence while also having to deal with the harsh prison environment and maybe some secret plots within the prison walls.
The plot could involve Naruto being sent to the Blood Prison on a mission. Once inside, he encounters various types of ninjas with different abilities and motives. There could be a mystery surrounding a powerful and dangerous prisoner locked away deep within the prison. Naruto's journey in the Blood Prison could also be a test of his character, as he has to make difficult decisions about who to trust and how to handle the dangerous situations that keep arising. He may even learn some new jutsu from the inmates or discover a hidden power within the prison itself.
In the 'Naruto betrayed blood prison fanfiction', perhaps Naruto is betrayed first by someone he trusts inside the prison. This betrayal makes him take actions that are misinterpreted as him turning on the prison. It might also be that a new, powerful inmate arrives and manages to turn the situation around so that Naruto looks like the bad guy. He could be forced to fight against the prison guards to protect himself or others, which would be seen as betrayal.