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.
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 possible plot for a 'kisame kidnaps sakura fanfic' could be that Kisame mistakes Sakura for someone else who has wronged his organization. He quickly grabs her and takes her away. Sakura, initially terrified, soon realizes the misunderstanding. She then tries to convince Kisame of his error while also looking for opportunities to free herself. Meanwhile, her friends from the village start a search and rescue mission, leading to a series of intense confrontations between the rescuers and Kisame's allies.
Sakura is smart, so she might try to outwit Madara by pretending to be compliant at first. She could start a conversation with him, trying to find out his motives and weaknesses. Then, when the time is right, she could use her chakra control skills to break free from any bindings and make a run for it. Maybe she would also try to send a hidden signal to her teammates if she gets the chance.
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 performing the kidnapping. His actions are against Sakura's will and are likely to cause distress and conflict.