Honestly, I'm surprised that no one has done a story or fanart of (yj)Bart Allen/Impulse/Kid Flash II (because from what I understand in the comics he was actually sent to the past because he was aging too fast, like he is 3 but looks older(?)) and (Next Avengers: Heroes Of Tomorrow) Francis Barton meeting? Because they both grew up in a post-apocalyptic world and didn't have a change to grow up as kids and had to learn how to survive said world.
Like, I get it they have differences (i.e. Bart has powers, Francis doesn't; Bart didn't lead a survivor group, Francis did; etc.)(I'm not including the whole Clint thing bc I doubt that Bart didn't have any parental figure/Hero that took care of him while he grew up, even if it was when he was young and it was during a short time) but I feel they could relate to each other and maybe become friends.
Also, I am not including Torunn, James, Azari or Pym because they unless it was changed in the comics grew up in a safe place and only faced the post-apocalyptic world when they were older, as in, they-didn't-grow-up-with-that older, so they could probably relate but in a different way I guess.