A fanfic could also focus on the side characters. For instance, take the neighbor and give him a more in - depth backstory. Maybe he had his own reasons for being so nosy. He could have a past that somehow connects to Satou's world in a more profound way, and his actions in the fanfic could either help or hinder Satou and Shio's situation.
One idea could be to explore a different ending. For example, instead of the tragic end in the original, the characters could find a way to break free from the dark cycle and start anew. Maybe Satou could have made different choices earlier on, like trusting the right people to help her deal with her complex emotions and situation.
One idea could be exploring the backstories of the side characters in more detail. For example, the neighbors or the people in the town where the main events take place. Another could be a 'what if' scenario, like what if Satou had made different choices earlier in the story.
One idea could be a time - travel plot where a character goes back in time to prevent a tragic event that usually happens in the regular Happy Tree Friends episodes. For example, Flaky could go back to stop Cuddles from getting into a dangerous situation that leads to his untimely death.
One plot idea could be Big Mac and Sugar Belle planning their future together, like building a new home in Ponyville. Another could be them facing a challenge in their relationship, such as a misunderstanding caused by a miscommunication at a local event. Maybe they go on an adventure together outside of Ponyville and discover a new part of Equestria.
Maybe a fanfic where a long - lost relative of the Weasley family shows up. This new character could bring a whole new set of dynamics to the family, with different magical abilities and a unique backstory that affects the family in various ways. For example, they might have a special connection to an ancient magic that the Weasley family has to learn about.
Satou is definitely a very interesting character to write about. Her complex personality, from her seemingly sweet exterior to her deeply troubled and possessive interior, offers a lot of room for exploration. Writers can delve into her psyche, trying to understand what really drove her actions and how she could have changed or been redeemed.
Perhaps in a fantasy world, a rich lord takes Merlin as his 'sugar baby' not realizing Merlin's true potential as a powerful wizard. As time goes on, Merlin uses his influence over the lord to bring about positive changes in the kingdom, like improving the living conditions of the poor. This could lead to a complex relationship where the lord slowly discovers Merlin's magic and they have to deal with the consequences.
Maybe an OC who isn't really into racing but has to enter the races to save their friend who has been trapped in a glitchy part of the track. This OC could be really good at solving puzzles and uses that skill to navigate the dangerous parts of the Sugar Rush courses.
One idea could be to explore a side character's backstory. For example, you could write about the early life of a minor fairy in the Sugar Apple Fairy Tale world. What made her the way she is? What dreams did she have before she got involved in the main story's events? Another idea is to create an alternate ending. Maybe in your fanfic, the main characters make different choices that lead to a completely different outcome for the fairy tale world. It could be a darker ending where the magic is lost, or a happier one where more characters find true love.
One idea could be that Naruto gets a second chance at life but in a different ninja village. He has to adapt to new rules and make new friends while still carrying his past experiences. For example, he might end up in the Sand Village and learn their unique jutsu.
One idea could be Naruto falling in love with a foreign ninja during a diplomatic mission. This would introduce new cultural elements and challenges to their relationship.