Oh my goodness, there’s so many Marks AU in the inbox right now I’m just gonna make a megapost and put them all together in like a Marks AU Blitz. Here we go!
Mark urges are relatively weak before puberty, then spike; the strength difference varies from person to person. Tadashi is totally blindsided. Hiro's were unusually strong before puberty and then didn't peak as much. Then, slowly, they weaken again, although they always remain stronger than before the spike.
Makes sense. Maybe Mark urges are related to hormone levels? And types? Like maybe Hero Mark people have a higher level of a certain hormone associated with those marks, while Villain Marks have something different? LOOK AT US WE’RE SCIENCING THIS BITCH
Imagine the marks AU Nerd Herd all ending up being Hiro's honorary siblings. Then each other's honorary siblings. Then Tadashi's found. And he's like ? Gogo is getting into a massive argument with Fred over food? Honey Lemon's joining in? Hiro joining in is nice, he's comfortable enough to argue, but then WASABI joins in. Tadashi is very confused. Hiro tries to bring Tadashi into the big fun sibling argument but he is too confused.
Can you blame him? He’s never seen Hiro this open with anyone, and suddenly he’s got this huge family group? And while he’s kind of happy to see Hiro with all these friends, part of him is a teeeeeeny bit....jealous.
When marks AU Hiro manages to catch up to the criminal villain mark, it's in a shop or something. There's a fight, and although everyone except the criminal is doing their best to reduce collateral, a giant mess still ensures. Mostly it's just stuff knocked over or onto the floor, but Hiro is still horribly ashamed. He could've prevented some of that, but he didn't, and some of the more minor stuff is very definitely his fault.
He can’t help it. He’s got his own Villain Mark urges, and making a mess helped calm them. The team points out that this is a good way to get the urges because no one gets hurt, and realistically if he hadn’t messed stuff up, the criminal definitely would have.
Villain mark Hiro's mark is partially red, and he tries to cover up the black with white paint. It works for about 2 hours then the paint starts to flake off from a combination of wrist movements and Hiro scratching at it because it ITCHES. Good makeup meant to be tolerable on a Mark lasts about 6 hours before it starts to itch.
I bet you cosmetic companies make SO MUCH MONEY in this AU. Mostly on Villain Marks, but they probably have a line of like glitter make-up or other things to make Marks pop on those who want to show theirs off.
Imagine Marks AU Tadashi fighting with a mixture of martial arts and baseball. He can make balls of light, he can probably make them hot or electrically charged and fastball them at people. Or just make them bright and fastball them at people's eyes.
He throws them, he bowls them, he tosses them, he bats them with sticks, he shoots them. Basically anything you can do to a sphere of power to make it hit someone, that’s what he does. He throws people off with the sheer variety of moves he uses.
Villain mark Tadashi's mark is freaking huge, it goes over the neckline of most shirts.
Like, over the collarbones and up the neck a little? That’s awesome.
So in an early marks AU post, I said that Tadashi and Hiro used laser tag and prank wars to let out their urges. Then it became conning each other out of dessert and cheating at everything from Monopoly to Go Fish to Twister. Then it became riding an illegally modified moped. Now I'm gonna tie all those together! At first the Hamabros just do the games thing, then Tadashi got the moped, then when Hiro turned 13 they discovered laser tag. Variety!
Maybe their urges shift over time, either changing with age, or maybe they become desensitized to whatever methods they use over time. So they have to constantly be trying new things, or the urges just keep getting stronger.
Marks AU is going out of control in the best way, who wants to make an open to all google doc for worldbuilding? Actually a google doc for filter AU worldbuilding is probably good too, that one got art as well.
*gestures to the above* That’s my attempt. I did a thing *faints*