One common plot could be that Amy Rose is kidnapped by a villain who wants to use her as bait to lure Sonic. The kidnapper might think that Sonic would come to save her, and they could set up a trap for him. Another plot could be that the kidnapper has a personal vendetta against Amy Rose herself, perhaps because she got in the way of their evil plans before. There could also be a plot where Amy Rose is kidnapped by mistake, and the kidnapper realizes their error but still decides to hold her captive for some other reason, like ransom or information.
In some fanfictions about Amy Rose being kidnapped, it's all about the mystery aspect. The kidnapper remains anonymous for a long time, leaving clues that Amy Rose has to figure out in order to escape or send a message to her friends. There could be a race against time, like the kidnapper has set a bomb or something similar. Also, the fanfiction could explore Amy Rose's mental state during the kidnapping. Is she scared? Or is she using her wits and courage to stay strong? This can add a lot of depth to the story.
In certain fanfictions, a jealous rival of Amy Rose could be the kidnapper. This could be another female character who has feelings for Sonic and sees Amy Rose as a threat. She might think that by getting rid of Amy Rose, she can have Sonic all to herself. Or it could be a character from Amy Rose's past who has some unresolved issues with her and decides to kidnap her to get revenge or make her pay for something that happened a long time ago.
Love is a common theme. Often it's about Amy's love for Sonic or other characters. Another theme is friendship, showing how she interacts with her friends in different situations.
Another plot could involve Batgirl using her wits while kidnapped. She might try to escape on her own by tricking the kidnappers or finding a weakness in their security. For example, she could pretend to be sick to get closer to a guard and then overpower them.
A possible plot is that a group of rogue ninjas kidnaps Sakura to lure Sasuke into a trap. They might want to steal his Sharingan or get revenge on him for past deeds. Sasuke, being the skilled ninja he is, uses his intelligence and combat prowess to outwit the kidnappers. He may also get help from his old friends like Naruto, but the focus remains on his relationship with Sakura and his determination to bring her back safely.
Another plot could involve Sakura being kidnapped by an enemy who wants to use her for her special abilities. This could lead to a story of her trying to escape on her own while also dealing with the kidnapper's demands and threats.
One possible plot could be that Amy Rose discovers her closest friend has been secretly working against her goals. For example, if she's on a mission to save Sonic, and she finds out that someone she trusted has been trying to undermine her efforts all along. This could lead to her feeling betrayed and having to re - evaluate all her relationships.
One common theme is vulnerability. Writers often explore how Amy, who is usually strong - willed, becomes vulnerable when hurt. Another theme is friendship. It shows how her friends react and support her during her time of pain. For instance, Sonic might come to her rescue.
Love is a very common theme. Often, there is a romantic relationship between Amy Rose and a vampire character. It could be a forbidden love due to their different natures.
Another theme is isolation. As a vampire, Amy is often set apart from her friends and normal society, which causes her a great deal of emotional pain. For example, in many fanfics, she has to hide her true identity from Sonic and the others.
One common theme is friendship. Amy Rose and Lemon often form a strong bond in these fanfictions, supporting each other through various situations.