Well, the 'angel of darkness' is likely to be a main character. It might be an entity with its own motives and powers. Another character could be Sonic. He might play a role in trying to save Amy Rose from the influence of the 'angel of darkness' or be involved in some way in the events that unfold.
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.
One great 'Amy Rose human fanfiction' is 'Amy's New Beginnings'. It focuses on Amy as a human dealing with everyday life in a unique world. It has a great plot that really delves into her character development.
Definitely not. Fanfiction is supposed to be a creative exploration of the existing characters and their stories. But when it involves sex, it not only distorts the original intention of the characters but also has a negative impact on the overall fan community. We should encourage the creation of family - friendly and positive fanfiction.
Even one of her friends like Tails could be the betrayer in a really unexpected plot twist. Maybe Tails is forced to betray her by some external threat. For example, if an enemy captures Tails and threatens to harm him or Sonic if he doesn't give away some important information about Amy Rose or lead her into a trap.
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.
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 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.