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Kids come first Au
The koopalings ages and more.
-Ludwig was adopted at 5 by Bowser who is his really great uncle. (Is 10 at the start of the story. )
-Lemme was adopted at 4 by Bowser with is baby brother Iggy who was 2. After being found in a fruit crate that was sent to the palace. (Lemme is 9 and Iggy is 7 at the start of the story.)
2 years later Bowser adopted 3 more koopalings plus an egg. Who all lost their families to plague.
The koopalings were 5-year-old cousins Roy and Wendy. Along with Bowser's other great-nephew 3-year-old Morton and an almost ready-to-hatch egg(Larry).
(Roy and Wendy are 8,Morton is 6, and Larry is 3 at the start of the story.)
Almost a year later the stork dropped off Jr.'s egg. ( Jr is 2 and a half at the start of the story.)
Kids come first Au
Mario addition
Mario has no idea how to tell the difference between an adult Koopa and Koopaling. So the first time he meets the Koopalings he's like "ok just some fancy-looking Koopa. They must be the big guns before Bowser." Then proceeds to kick the koopaling's tails. It isn't until much later that he realizes he's been fighting literal children the oldest being 8 the first time they meet and that's only because Luigi himself tells him.
Kids come first Au
Princess Peach addition
Peach is not a bad person she's just tired of being kidnapped. I mean would you like it if someone you barely know broke into your house, hurt the people you care about, kidnapped you just to ask you to marry them, and when you say no gets all mad about it and keeps you there so you can "think about it". So no Peach isn't a bad person she's just tired. She's tired of having to rebuild her castle and other parts of her kingdom. She's tired of having to escape her capture and make the long trip back home with little to no supplies.
While hoping her father and people are doing well in her absence. Not to mention the fact that this has been happening almost every month since the day she turned 18.(Shes 23 at the start of this Au)
Kids come first Au
The kooplaings may not complain to their dad but they do complain to Kamek about Peach. Every time she escapes they go to Kamek and just ask him why "king dad" keeps trying to marry Peach when she's only mean to him all the time and keeps running away. Kamek usually just says that he's in love and that they'll understand when they're older. But in reality, he has no idea why his son keeps trying to marry someone who doesn't love him. He can see the emotional toll, Bowser takes every time Peach escapes. So when Jr. comes to him talking about a nice man in green that gave him candy and really cool bandaids and did he mention he was nice and how he wished Princess mom was that nice and how he wouldn't mind if dad married the man in green. Kamek being Kamek already knows who Jr. is talking about and can't help but agree with Jr. (even if it's a bad idea)
Kids come first Au
So we all know Bowser is a dad to like 8 kids and is looking for a mom(peach) for them. But what if the Kooplings hate Peach for all the times she's rejected Bowser. Like just picture it Bowser wanting to do right by his kids and one by one introducing them to Peach as he steadily gets more kids. But Peach not wanting anything to do with Bowser or his kids and just gives all of them the silent treatment. So that frustrates the Kooplings and they just stop trying to get along with Peach because they think she's mean. But they don't say anything to their dad because they want him to be happy even if they don't like Peach.
Then Mario and Luigi get sent to The Mushroom Kingdom and start savings Peach and during one of these rescues, Luigi is running late and has his first-ever encounter with a hurt Jr. Luigi just being the angel that he is wins over Jr. with that one interaction, and from there starts to try and get Bowser and Luigi together.