First, know the characters well. Understand their personalities, motives, and backstories. This will make their reactions more believable. For example, if you're writing about Todoroki reacting to something, you need to consider his complex family situation and how it shapes his views.
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.
One interesting mha reacts fanfic could be where the characters react to seeing their future selves. It adds an element of mystery and self - discovery. For example, Midoriya seeing himself as a fully - fledged hero might make him realize how far he has come and what he still needs to achieve.
To write a good MHA reacts fanfiction, pacing is important. Don't rush through the reactions. Let the characters take their time to process what they're seeing. For instance, if they're reacting to a tragic event in an alternate universe, give them time to show their shock, sadness, or anger. Also, dialogue should be in - character. Each character in MHA has their own way of speaking, like Todoroki's more reserved speech compared to Uraraka's bubbly dialogue.
One way to analyze it is by looking at the emotional response it elicits. If it makes the reader feel angry about the injustices of the war, or sympathetic towards the characters, that's an important aspect. For example, a fanfic that focuses on the plight of civilians during WW2 might make the reader feel deep sympathy.
Well, they might be really surprised by the unique and wild world of One Piece. The RWBY characters are used to their own world with Grimm and Dust, while One Piece has Devil Fruits and the Grand Line. They could be shocked by the powers of the Straw Hat Pirates like Luffy's stretching ability. Maybe they'd be inspired by the strong bonds between the One Piece characters, which could make them reflect on their own relationships in RWBY.
First, know the MLP characters well. Their personalities, quirks, and relationships are crucial. For example, Rainbow Dash is brave and competitive, so when writing her reaction, it should be in line with that. Second, create an engaging situation for them to react to. It could be something like a mysterious object appearing in Ponyville. Third, keep the reactions true to the characters. Don't make Twilight Sparkle suddenly act completely out of character when she encounters a new spell.
The RWBY characters' opinions would vary greatly. Ruby, as the team's eager beaver, would be all in for the One Piece fanfiction. She'd be like a kid in a candy store, loving every new discovery. Weiss, being a bit of a snob sometimes, would have a more measured approach. She might nitpick about things like the logic of Devil Fruits or the pirates' lack of proper decorum. Blake would find kinship in the outcasts and rebels in One Piece, and her views would be colored by that. Yang would be the one shouting at the page during the intense fight scenes, really getting into the action. So, in summary, their reactions are as different as their personalities.