Something that I think would have been a fun twist in MHA:
I've talked about the concept of Endeavor's former sidekicks before. His current ones throughout the series are all much younger than he is, so I have a headcanon that he did have a previous team that was closer to him in age. This previous team is no longer with the Endeavor Agency for three major reasons. The former sidekicks:
Are dead or retired due to the dangerous and physically demanding career.
Or found out about the abuse and left.
And that second one has a lot of interesting implications. Did they try to intervene on behalf of Rei and the children? Did they quietly bow their heads and leave? If they reported the abuse, even anonymously, the Commission could have covered it up in favor the No. 2 Hero being an invaluable cog in their system. Whatever choice the hypothetical sidekicks made, their inability to save the Todoroki family from Endeavor would have eaten at them the rest of their lives.
I think it would have been interesting if sidekicks who left the Endeavor Agency fell in with the Paranormal Liberation Front. Especially if the Commission is corrupt enough to cover up abuse and enable their heroes, tearing down Hero Society would appeal to those who perceived themselves powerless to help the family.
The scenario I'm imagining, though, is the former sidekicks somehow recognize Dabi as Touya before the reveal. These are people who would have known him when he was a child, after all, and recognizing him as their former boss's dead son is an impressive feat when his own family didn't.
Kinda picturing this scene from Arcane S2 happening at Gunga Mountain Villa.
“That man will face justice.”
A sort of Anti-Endeavor Agency forming if you will. Current sidekicks vs former sidekicks backing father and son respectively.
Whether or not Dabi would accept the gesture or wipe them all out in a fiery blaze for their former inaction as hypocrite Pros is a coin toss, though. Personally, I kinda lean toward the latter being his more likely response, but I can also see him going the other way since his overall plan did end in self-destruction.
There's a lot to consider that's too much to put in a single post right now, but I am playing with this idea fanfic-wise.