A possible plot could involve Classic Amy being brought to the modern world. At first, she is completely bewildered by all the strange new things. Modern Amy takes it upon herself to 'civilize' Classic Amy. However, Classic Amy's old - world values start to make Modern Amy reevaluate her own life. In the end, they both grow as characters and become good friends, with Classic Amy adapting to some modern ways and Modern Amy incorporating some classic values into her life.
One idea could be that they initially clash due to their different outlooks. Classic Amy might be more reserved and proper, while Modern Amy is bold and outspoken. They could then learn from each other. For example, Classic Amy could teach Modern Amy about the charm of old - fashioned courtesies, and Modern Amy could introduce Classic Amy to new technologies and modern ways of thinking.
Maybe they meet in a time - travel scenario. Modern Amy accidentally travels back in time and meets Classic Amy. They start competing for the affection of a certain character. But as they get to know each other better, they realize they have more in common than they thought and end up teaming up to achieve a common goal, like saving their town from a disaster.
One idea could be modernizing the character of Amy in a classic setting. For example, giving her modern technology like a smartphone in a story set in a Victorian - like classic era. This can create interesting plot twists as she uses it to solve problems in a world that doesn't understand such devices.
For Classic Amy, you can focus on her adapting to modern things. Show her initial shock and confusion, like when she first sees a smartphone. Then, as she starts to understand it, her character can grow in confidence. For Modern Amy, her encounter with Classic Amy can make her realize the value of simplicity. You can develop this by having her slow down and appreciate the little things that Classic Amy does, like writing a handwritten letter instead of just texting.
One idea could be that Ian and Amy have to team up secretly to uncover a hidden clue that was missed in the original search. This would create a lot of tension as they try to keep their alliance from their respective families.
In some fanfictions, Sonic and Amy's pregnancy could be a result of a magical accident. They then have to learn how to be parents quickly. Sonic, who is used to being on the go all the time, has to slow down and be more responsible. Amy, on the other hand, is overjoyed but also a bit worried about how Sonic will adjust. They both grow closer as they prepare for the arrival of their baby.
One interesting plot idea could be Amy going on a solo adventure to find a clue that she believes was overlooked by the rest of the Cahill family. It would show her intelligence and determination in a new light.
One idea could be that Amy and Jake have to solve a mystery in their neighborhood. They could start by interviewing neighbors and finding strange clues. Another could be a time - travel plot where they end up in a different era and have to adapt while still maintaining their relationship. Maybe they could also go on an undercover mission together where they have to pretend to be a different couple to catch a criminal.
One plot idea could be that Shadow and Amy are on a mission together to save Sonic who has been captured by a new villain. Along the way, they start to understand each other's motives and personalities better. Amy's positive attitude might start to rub off on Shadow, who is usually more brooding.
One idea could be that Amy Rose gets lost in a mysterious forest and Shadow Lemon has to find her. Along the way, they face various challenges that make them rely on each other and in the end, they form a deep friendship.
One idea could be that Amy Rose decides to break away from her traditional sweet image and joins a group of rebels in Sonic's world. She might start wearing edgier clothes and using her hammer in a more unorthodox way, causing chaos among the usual order. For example, she could challenge Sonic to races not for his love as before, but to prove her newfound independence and power.
A plot could be where Amy discovers a prophecy about Dark Super Sonic being the key to saving their world from a greater threat. So, she decides to follow him around and tries to understand his powers. As she does this, they form an unlikely bond. Along the way, they face various challenges together, and Amy's love for Sonic (even in his dark form) might be the driving force that helps them overcome all the difficulties.