Her friends could also play a crucial role. If she has a group of loyal friends, they might band together to find her. They could use their knowledge of the area where she was last seen or any clues they can gather to track down the kidnappers and save her.
There could be a mysterious hero figure. Maybe a powerful ninja or a kind - hearted stranger who hears about her kidnapping and decides to step in. This person might have special skills or resources that are needed to take on the kidnappers and rescue Himawari.
Maybe an unexpected character like a wise centaur from the forest near the camp. They are known for their wisdom and strength in the Percy Jackson universe, and might step in to help Annabeth when they see her in trouble.
Alec might also come to her rescue. As a skilled Shadowhunter, he has a strong sense of duty. Plus, he's part of Clary's group, and he wouldn't stand by and let a fellow Shadowhunter be attacked by a demon.
They might start by gathering information. Harry could use his invisibility cloak to sneak around and eavesdrop on potential suspects. Ron would probably try to contact his brothers who have connections in different parts of the wizarding world for any leads.
Maybe Pepper Potts could find out what Tony has done and rescue Peter. She might be able to talk some sense into Tony and make him release Peter.
It could be Nightwing. He was once Robin himself and has a special connection to the current Robin. Nightwing might hear about the kidnapping and step in to save Robin, using his own unique fighting style and experience.
His friends like Kuwabara and Kurama might also join in the rescue. Kuwabara with his tough fighting spirit and Kurama with his cunning and powerful abilities could be a great help in getting Keiko back from Toguro.
There's also a possibility that Hinata's own clan, the Hyuga, would take matters into their own hands. They have their own unique techniques and a sense of pride. They would not allow the Akatsuki to keep one of their own captive for long and would send their strongest members to retrieve Hinata.
It could be an enemy from one of his past cases. Someone who holds a grudge against L for getting them caught or ruining their plans before.
It could be a rival guild member who wants to use Juvia as leverage against Fairy Tail. Maybe someone jealous of her powers or her relationship with Gray.
The Death Eaters are an obvious choice. They've always been after Harry, so they could easily be the ones to kidnap him. They'd want to take him to Voldemort to prove their loyalty and also to finally get rid of Harry for good.