Well, 'Sonic Reacts to the New World' is a very interesting fanfiction. In this story, Sonic is transported to a new and strange world and his reactions to the unfamiliar environment, new characters and different rules are really engaging. There is also 'Sonic's Reaction to a Mysterious Power' where Sonic has to deal with a power he doesn't understand and his reactions drive the whole plot forward.
One great 'sonic reacts' fanfiction is 'Sonic's Surprising Reactions'. It has Sonic reacting to different zones in really funny ways. Another is 'When Sonic Reacts to His Friends' Pranks' which shows his hilarious responses to the mischief of Tails and Knuckles.
One popular sonic watches sonic boom fanfiction might be those that focus on Sonic's new adventures with his unique watch gadget. For example, there could be stories where the watch has special powers that Sonic discovers and uses to defeat enemies in the Sonic Boom universe.
One interesting story could be about the characters' reactions to different timelines. For example, Sans might react in a unique way when faced with a timeline where everyone is overly aggressive. Another could be the reactions of the monsters to human technology that they've never seen before, like a smartphone. And there could also be stories about how the characters react to fan - made scenarios, such as a 'what if' situation where Asriel didn't turn into Flowey.
Some MHA reacts fanfiction focuses on the characters reacting to fan - made scenarios. For instance, they could react to a 'what if' situation like All Might never losing his power. This can show how the relationships and the overall story dynamics would change in such a scenario, and it's really fascinating to see the characters' responses.
First, think about what Sonic would realistically react to. It could be a new villain, a strange situation, or something related to his friends. Then, start with a strong opening that sets up the situation for Sonic to react. For example, 'Sonic was running through Green Hill Zone when suddenly, a strange portal opened in front of him.'
One great AOT reacts fanfic is 'AOT Reacts to Modern Technology'. It shows the characters from Attack on Titan being exposed to things like smartphones and cars for the first time, which creates really interesting and humorous scenarios.
One great 'sonic naruto fanfiction' could be those that combine their unique abilities in a battle scenario. For example, Sonic's speed and Naruto's jutsu working together to defeat a common enemy. Another interesting one might be where Sonic gets transported to the Naruto world and has to adapt to its ninja culture. There are also fanfictions that focus on the friendship between Sonic and Naruto characters, which can be really heartwarming.
One could be 'The End of Sonic's Run' which explores the aftermath of Sonic's death on his friends and the world. It shows how they struggle to come to terms with the loss.
One interesting 'Honkai Impact Reacts Fanfiction' story could be about the characters reacting to a different version of their own world. For example, they might react to a world where the Honkai are far more powerful and they have to find new ways to fight. Another could be their reactions to seeing alternate versions of themselves from different timelines. It's really fascinating to see how the characters would handle such unexpected situations.
One interesting 'rwby weiss reacts fanfiction' could be where Weiss reacts to a new Grimm threat in a way that shows her growth. Maybe she uses her Glyphs in a completely new and creative way that surprises her teammates. Another could be her reaction to a sudden change in the school curriculum at Beacon. She might initially be resistant but then find a way to excel at it.
One interesting 'Re:Zero Reacts Fanfiction' story could be where the characters react to modern technology. For example, Subaru seeing a smartphone for the first time and being completely baffled by its capabilities. Another could be them reacting to different anime worlds, like seeing the action - packed scenes of 'Attack on Titan' and being in awe.