The entire Team 7, which includes Naruto, Sasuke, and Kakashi, would be the most likely ones to attempt a rescue. But it's also possible that other shinobi from the Hidden Leaf Village would join in. For example, Shikamaru, known for his intelligence, could come up with a strategic plan to outmaneuver Deidara. Ino might also be involved as she is Sakura's friend and has some psychic abilities that could be useful in locating Sakura.
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.
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.
In such a fanfiction, Deidara might use Sakura as a hostage to bargain with the Hidden Leaf Village. He could be after some secret jutsu or valuable information that the village has.
It could be Naruto. Naruto has a strong bond with Sakura and would sense that something was wrong. He'd probably track her down using his amazing sense of smell or by asking around. Once he found Sasori, Naruto would use his Rasengan and his newfound Sage Mode powers to take on Sasori and rescue Sakura.
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.
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.
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.
Itachi himself could be seen as the main antagonist in this scenario as he is the one carrying out the kidnapping. He is acting against Sakura's will and causing a dangerous situation for her.
Kakashi could be another character to rescue Sakura. He is a very experienced ninja and has mentored Sakura in the past. He might use his Sharingan or some of his unique jutsu to outwit the clone Itachi and free Sakura. And he's always looking out for his students, so it would be in character for him to step in and help.