Harry Potter is the most obvious choice. He has a deep connection with Ginny and would stop at nothing to save her. Ron and Hermione would also be likely candidates. Ron, being Ginny's brother, would be extremely motivated to rescue her. Hermione, with her vast knowledge of magic, would be crucial in coming up with a rescue plan. Neville Longbottom could also be a potential rescuer. He has shown great courage and has a strong sense of loyalty towards his friends. He might step up to the challenge of rescuing Ginny from the Death Eaters.
The Cullens are the most likely. Edward, with his mind - reading ability, can try to sense where Renesmee is. Bella, with her strong will and vampire strength, would be at the forefront of the rescue mission. And Carlisle, with his wisdom and leadership, would plan the whole operation.
In 'Aria Gets Kidnapped Fanfiction', a group of her classmates could be the ones to rescue her. They might form an impromptu rescue team, pooling their different skills. One could be good at hacking and find the kidnapper's location through digital means, another could be athletic and lead the charge when they reach the kidnapper's lair. Additionally, an unexpected ally, like a character who has always been in the background but has a hidden talent or power, could come forward to rescue Aria. This could add an element of surprise to the story.
Naruto would be a very likely character to be involved in the rescue. He and Gaara have a special bond, and Naruto is always ready to save his friends. Rock Lee might also be involved as he is very loyal to his comrades. And Temari, Gaara's sister, would surely not sit idly by when her brother is kidnapped. She would be one of the first to set out to rescue him.
A plot twist could be that Ginny is not really Ginny. The Death Eaters might have kidnapped a disguised decoy while the real Ginny is off on a secret mission. Or, perhaps the place where she is being held has some ancient magic that starts to affect the Death Eaters in unexpected ways, like making them see their worst fears. This could give Ginny an opportunity to escape. Also, it could be that Ginny's kidnapping was a set - up by someone within the Order of the Phoenix who has been secretly working for the Death Eaters all along, but Ginny uncovers this plot and uses it to her advantage.
Jace is an obvious choice. His relationship with Clary is so strong that he would be the first to rush to her aid. But don't forget Luke. As a werewolf and someone who has been like a father figure to Clary, he would be determined to rescue her. And then there's the Inquisitor. Depending on the situation, she might see the importance of saving Clary and use her authority and resources to mount a rescue operation.
Bakugo would be a very likely candidate. He and Kirishima are good friends, and Bakugo has a strong sense of loyalty (even if he doesn't always show it in the most obvious way). His powerful quirk and his determination would drive him to go after Kirishima and bring him back.
Voldemort himself, of course, is the most prominent in a sense. But in the fanfiction, his relationship with the other Death Eaters could be different. He might be more distrustful or have different expectations of them. And then there's Barty Crouch Jr. He could be a major player in the fanfiction, with his skills in disguise and dark magic. His actions could drive some of the major plotlines in the fanfiction.
Their manager could be a likely hero. They know the boys well and would be highly motivated to get them back. They probably have connections and resources that could be used to track down the kidnappers and negotiate for their release.
Harry Potter is an obvious choice. Given their strong friendship and the many adventures they've had together, Harry would surely do everything in his power to rescue Hermione. He has faced many challenges before and wouldn't stand by while his friend is in Azkaban. Another likely character is Ron Weasley. He and Hermione have a complex relationship, but he would definitely not let her rot in Azkaban. Ron has his own skills and resources within the wizarding world that he could use to plan a rescue. Dumbledore, if he were still alive in the fanfiction, would also be a likely rescuer. He was always one to see the good in people and Hermione's intelligence and value to the wizarding world would make him want to save her. He has the power and influence to challenge the decision to send her to Azkaban.
Sam is also a probable candidate. Given her feisty nature, it could lead to some interesting scenarios where she tries to fight back against the kidnapper. And her relationship with Carly and Freddie would drive them to take action.