A fellow musician or an old friend from their hometown could also be the hero. The fellow musician might have influence in the music industry and could use that to put pressure on the kidnappers or get help from other big names. And the old friend would have that deep emotional connection and loyalty to the boys, and would stop at nothing to rescue them.
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.
Another possible hero could be a super - fan. This fan might have some special skills like being really good at hacking or having a lot of knowledge about the underworld from researching for fanfiction or something. They would be determined to save One Direction because of their love for the band.
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.
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.
It could be Louis. He has always seemed very connected to the group's roots. In fanfiction, he might realize how much the fans miss the band and how much they all still have in common musically. So, he starts reaching out to the other members one by one to see if a reunion is possible.
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 a fanfiction, it could be a shadowy organization. They might have heard rumors about Raven's unique powers and decided to take her. This organization could be researching ways to gain superhuman abilities and believe Raven holds the key. Or it could be a deranged fan of Raven's powers. He might be obsessed with her and think that by kidnapping her, he can have her all to himself. Additionally, a vengeful spirit from Raven's past could be the kidnapper, seeking revenge for something she did long ago.
Enemies from her past, such as old villains she's fought against, would be likely kidnappers. They might hold a grudge for her previous defeats and want to use her for revenge or some dark purpose.
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.
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.
Luna Lovegood would probably be a huge One Direction fan. She has such an open and eccentric mind that the unique style of One Direction would appeal to her. She might even believe that they have some sort of magical connection to the wizarding world that no one else has noticed yet. And she would definitely not care if others thought it was strange.
The Yiga Clan could be likely kidnappers. They've always been enemies of Link and would love to get their hands on him. They might see kidnapping him as a way to stop him from interfering in their plans. Another possibility is the Gerudo thieves. Although not all Gerudo are bad, there could be a group of them who think Link has something valuable and decide to take him hostage.