Next, Eren could try to escape. Given his strong will, he won't just sit there and accept being kidnapped. He might use his titan powers in a creative way to break free from Levi's clutches.
Perhaps other characters will get involved. For instance, Armin might figure out that Eren is missing and suspect Levi. Then he could start his own investigation to find Eren and rescue him. This would lead to a whole new set of adventures and challenges.
Well, in this kind of fanfiction, the plot usually depends on the writer's creativity. It could be that Levi is forced to kidnap Eren due to some external threats. For example, there might be a group that wants to harm Eren, and Levi believes that by taking him into his own 'protection' through kidnapping, he can keep Eren safe. However, this also sets up a lot of potential conflicts between them and other characters.
Well, one possibility is that Cloud's friends would immediately start a rescue mission. They might track Sephiroth's usual hideouts. Since Sephiroth is a powerful foe, they would have to be very strategic.
One possibility is that Gohan's friends and family, especially Goku, would immediately start searching for him. They would use all their powers and resources to track Vegeta's whereabouts. Goku might be enraged and ready to fight Vegeta to get his son back.
Well, in a fanfiction where Captain Hook kidnaps Wendy, one possibility is that the Lost Boys come to her rescue. They might use their knowledge of the island and their unique skills to outwit Hook and his pirates.
In fanfiction, when Eren meets Levi in the underground, they might initially have a tense encounter. Levi could be suspicious of Eren's motives. For example, he might question Eren's presence there as the underground is a dangerous and lawless place. Eren, on the other hand, could be in awe of Levi's skills and reputation.
Another aspect could be the emotional turmoil for the other Avengers. They would surely be scrambling to find Tony. Captain America might feel especially guilty, considering their past differences. The team would have to put aside their differences completely to rescue Tony. They might start by gathering intel on Thanos' whereabouts and formulating a plan that involves their unique skills. For example, Black Widow could use her espionage skills to infiltrate Thanos' base, while Thor could provide the brute force needed in a direct confrontation.
One possibility is that Naruto's friends would immediately launch a rescue mission. They would likely gather intel about Kumo's motives and whereabouts. For example, Sasuke might use his Sharingan to track any clues left behind. Sakura would prepare medical supplies in case of injuries during the rescue.
One possibility is that her friends, like Percy, would immediately start a rescue mission. They would likely gather all the resources and allies they could find. Maybe they'd consult the Oracle for some clues on where Kronos has taken Annabeth.
Well, one possibility is that Goku's friends would immediately start a search and rescue mission. Vegeta, being his rival but also an ally, would probably be at the forefront. He'd be furious that Broly dared to kidnap Goku. They'd likely track Broly's energy signature to wherever he's taken Goku. Another thing could be that Goku, while kidnapped, tries to reason with Broly. Maybe he discovers that Broly has some deeper issues or motives for the kidnapping that could potentially be resolved through conversation.
Perhaps Madara has some ulterior motives for kidnapping Hinata. He might want to use her as a bargaining chip against the Hidden Leaf Village. Or he could be interested in her unique abilities. In that case, the Hidden Leaf would have to decide whether to meet Madara's demands or try to outwit him to get Hinata back safely.