So Alt (Reverse) Kim is afraid of water while Alt Zoe treats Alt Chloe like a servant?
I didn't think much about the minor characters in Miraculous yet but yeah I think that would be a good characterization for Reverse Kim.
Reverse Kim when he was a child like all children was a bit scared of the water because of the deep end and all, he was a bit scared something would jump out of the water like in those horror movies (don't ask what horror movies I've watched). However a person he trusts (maybe a parent or close friend or maybe even a kind life guard) gives him a lesson that its okay to be scared but not let that fear control you or you'll never be able to do anything you want. Reverse Kim in my AU wears glasses so when he goes swimming he usually wears contacts. For Reverse Kim i want to touch on themes of betrayal someone he trusted was the reason for his inane fear of the water. So taking inspiration on how Original Kim played a mean prank on marinette making her scared of relationships (which is a plotline I really don't love in that universe but whatevs) Reverse Kim gets a mean prank pulled on him maybe by Emonette herself. Now the prank ended up with him ending up on a diving board several feet above the swimming pool like in Derision and he's slowly backing away confused as to why the person he trusts is throwing harsh words at him his contacts had somehow fallen out so he can't see clearly and he slips fall into the water below right in the deep in.
In that moment all he felt was fear the slip was so unexpected like a rollercoaster ride and he was suddenly flung in the air but he didn't like the rollercoaster ride and he certainly didn't like the next 10 minutes. His senses were askew barely processing the situation and since he was a kid (maybe around 10) he had one thought on his mind. He was dying, he knew how to swim yes but this was the first time in the deep end and the situation was confusing as it is and just like that all his swimming skills vanished and he tried desperately flapping his arms in the water as he panicked which resulted in him using up his oxygen more quickly. He was able to get to the surface but at the cost of severe trauma a life guard came to check on him asking if he was alright but when Kim looked back into the water he'd just swum up from and enhanced his fear of the deep end and water in general. Ever since then he stayed away from the swimming pool and any forms of water.
I was definitely inspired by the Derision episode and always wondered how Marinette was scared more about the bugs then falling into the water unexpectedly off a diving board which was several feet in the air. I would've been scared out of my mind especially at a younger age.
Reverse Kim is not a happy go lucky fella like in the Original he is very much a loner but because of this tendency of being alone he doesn't become an utter jerk like in the original. he actually becomes really good friends with Robot Max feeling like he's the only one he can trust because he's a robot and a robot can't lie. And thats how Reverse Kim eventually joins Betterfly's organization and Gabriel Agreste gives him courage to fight back against the biggest threat their world's ever known.
The Supreme.
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Reverse Zoe would treat Reverse Chloe badly definitely but I don't want to make Reverse Zoe an exact version of Original Chloe so I don't think she'd spend too much time bullying Nice chloe because Chloe is already hated by a lot of people in Paris because of her father's political plans actually being concise put some political parties don't like it due to admiring the Supreme instead and don't like how the Mayor is actively against the Supreme and tries going against his presence as much as he can. People also don't like Reverse Chloe because of her meek and Nice nature stepping all over her since being kind is seen as weak in this Universe and the Mayor's daughter can't afford to be weak. Chloe is used to evading Zoe she does it often and Zoe doesn't want to spend too much time on finding her because she has 'better things to do'.
Reverse Zoe instead of using physical power through her father's influence like Original Chloe does instead uses Emotional Manipulation a different kind of evil which is a much better weapon against Nice Chloe since she's so used to the Cruelty.
Reverse Zoe is an independent person she doesn't have a servant like Sabrina was in the original she has a sense of independence which ends up making her become rivals with Emonette.
My Reverse Au isn't just characters becoming a copy of another character in the original they become a copy of their core foundation which might have similarities with some of the characters in the Original but not the exact same since they still are a version of their original.
Since Zoe's core foundation was being nice as an opposite of chloe in the Reverse she won't be so nice but her independence will stay.