Stefan might get involved too. Although he and Damon have their differences, he wouldn't let Damon harm Jeremy. Stefan could try to reason with Damon first and if that doesn't work, he would resort to other means to free Jeremy.
Bonnie would also be on the rescue mission. Given her witch powers, she might be able to track Jeremy using some spell. She has a close relationship with Jeremy and wouldn't let Damon get away with this.
Elena would definitely be one of the first to try. She loves Jeremy and would do anything to save him. She would probably start by looking for Damon's usual hiding places.
One possibility is that Damon believes Jeremy is a threat to his and Stefan's relationship. Jeremy has been involved in a lot of vampire - related affairs and Damon might think that by kidnapping him, he can control the situation better. He could be planning to either turn Jeremy into a vampire or just keep him locked up until he figures out what to do with all the chaos in the town.
Gale might also attempt to rescue Katniss. He's her friend from District 12 and is quite skilled in his own right. He would be furious to hear that Cato has kidnapped Katniss and would likely gather resources and allies to try and save her.
The rest of Team 7, like Sakura. She may not be as strong as Sasuke or Naruto, but she has a strong will. She'd be worried sick about Naruto and would do whatever she could to help in the rescue. Plus, she might be able to use her medical skills to treat Naruto if he's injured during the kidnapping situation.
Annabeth would most likely be the first one to try to rescue Percy. She and Percy have a deep connection, and she wouldn't stand by while he's in danger. She's smart and resourceful, so she'd come up with a plan to find out where Aphrodite has taken him and then figure out a way to get him back.
Naruto would probably be one of the first to try and rescue Kakashi. He has a strong bond with Kakashi and would not stand by while his teacher is in danger.
Sasuke might also be involved in the rescue. Despite their complicated relationship, he still has some feelings for Sakura. And he wouldn't want to see her in the hands of someone like Deidara. Also, Kakashi, as their former sensei, would likely lead a rescue mission. He has the skills and experience to deal with Deidara's explosive attacks and find a way to save Sakura.
One great Damon and Jeremy fanfiction is 'The Bond Beyond Blood'. It delves into how Jeremy, after his experiences in Mystic Falls, starts to see Damon in a new light. Their relationship evolves from one of distrust to a sort of begrudging respect and then to an unexpected friendship. The story is full of action and the typical Vampire Diaries drama.
Naruto would surely be one of the first to try and rescue Sakura. He has always been protective of her and would not stand by while she's in danger.
Fanfiction.net is also a popular place. There are many different categories and tags that you can use to search specifically for Damon Jeremy fanfiction. However, the quality can vary, so you might need to do some sifting through the results.
There could be a fanfiction where Damon and Jeremy form an unlikely alliance against a common enemy. In this story, their relationship develops from mutual distrust to deep friendship as they face challenges together. They learn to rely on each other's strengths and overcome their own weaknesses. It could also explore their individual backstories and how those experiences shape their actions in the story.