I think All Might's reaction would be interesting. He might see Loid as a kind of hero in a different sense. Loid's selfless dedication to his mission to prevent war, even if it means living a double life, could remind All Might of his own role as a symbol of peace. All Might would probably respect Loid's determination.
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.
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.
Well, Spy x Family fanfiction can be really interesting. Some fanfictions might explore different relationships between the characters in more depth. For example, they could focus on the bond between Anya and Loid in a new situation that wasn't shown in the original manga or anime. It's also fun to see how authors play with the spy and assassin themes in unique ways.