There could be some new characters introduced in the fanfic. Maybe a powerful wizard from a far - off land who has heard of Harry's plight and decides to help. Or perhaps a group of outcasts in the wizarding world who see Harry as a symbol of their own struggle against the unjust system and come to his aid.
Obviously, Harry Potter himself is a key character as the story is about his release from Azkaban. Dumbledore is likely to be important too. He has the power and influence within the wizarding world to potentially free Harry. His wisdom and knowledge of the situation would play a big role.
Ron and Hermione are the most likely ones. They are his best friends and have always been by his side through thick and thin. They would probably follow him without hesitation and use their own skills, like Hermione's vast knowledge and Ron's loyalty and practical skills, to assist in the ship - stealing adventure.
One possible plot could be that Harry was wrongly imprisoned. Once released, he'd be on a quest to find out who framed him. He might start by gathering his old friends like Hermione and Ron. They would then dig into the dark secrets of the wizarding world that led to his false incarceration.
Hermione would surely be one of the first to help. She is highly knowledgeable in magic and would likely try to use a healing spell or find a potion to stop the bleeding.
Hermione might be one of the helpers. She's very intelligent and could come up with a clever plan to get Harry out. Maybe she uses her knowledge of ancient spells.
It could be Hermione. She's always been smart and resourceful, and she might have found evidence to prove Harry's innocence and get him released.
Hermione would most likely be the first to help. She's always been there for Harry and is very knowledgeable in potions. She might quickly assess the situation and try to find a counter - potion or spell to revive him.
Dumbledore, if he were still alive in the fanfiction, would likely have some wise words and advice for Harry. He might have some secret knowledge about dragon transformations that could be crucial in helping Harry. Also, Neville could come in handy as he has proven to be brave and resourceful, and he might be able to find some rare plants that could be of use to Harry in his new form.
One possibility is that Dumbledore discovers new evidence that clears Harry's name. Maybe there was a misused spell by the Ministry that made it seem like Harry was guilty. Dumbledore then uses his influence and magic to break Harry out of Azkaban and they begin to expose the real culprits behind the false accusations.
In the fanfic, there might be changes in the security measures of Azkaban. For example, new spells or wards could be added to prevent prisoners from escaping more effectively.