Yeah, I have thought of redesigning MLB characters. I actually have an old sketch for a Ladybug redesign, though I have a different idea now of how I would design it than back then.
And ooh, both ideas sound pretty cool! MLB would probably be easy design wise— at least talking civilian forms since we have a lot of canon designs with similar outfits to go off, I'd say. So, to have the designs count as canon accurate to the art style would be easy. I think the hero outfits would definitely be a lot different, considering that LMK has bulkier designs and uses a lot more armor than MLB. It makes sense due to the fact that MLB is a magical girl adjacent show. Those don't ever use much armor and have slimmer designs besides from ruffles and bows mainly, MLB hero forms are latex aside from some additional accessories and padding on the boy's designs.
For LB, her main weapon would still be her yo-yo and would fall into the same mythical weapons like the Monkey staff, the wind fan, and the lantern Mac used in LMK. Lore wise, maybe the yo-yo could be something Nüwa made—since she's sorta a creator god— I think—and was stolen accidentally by Tikki or at least given to her from Nüwa. CN, however, since his main ability cataclysm doesn't connect to his main weapon, I would replace his baton with big bulky gauntlets. To sorta not make another really strong staff like weapon. They would have the same effect as his in show cataclysm does.
In the case of LMK, if they were in MLB, it's both easy and difficult. The roles are the easy bit. MK would very obviously take the monkey kwami, Mei the dragon, and Red Son the bull. MK would stumble across his kwami in a similar way he does with the staff and LB and CN do in their shop. Him only found out later that SWK, the past holder, had been the one to place it to be found. Mei and Red Son would have had it past down generational. I picture Tang as the guardian that takes care of the kwamis, which would make a link to Tripitaka since he was the guardian in swk's time but wasn't able to pass it down. Tripitaka would've given Swk his miraculous. The rest becomes a bit more complicated. Considering none of the main have the Ladybug or Cat miraculous, it makes it hard to accomplish evil in a similar set up to MLB considering they wouldn't be able to get rid of akumas. At least the more known way. LBD makes the most sense to have as hawkmoth, meaning the mayor could be the peacock holder. Maybe originally, Mac has the fox miraculous, but to mirror when LBD gives him a power up in s3; he could take hold of the peacock miraculous. Who knows!
This was very nice to brainstorm, but I fear if I think about this anymore.. I'll have another au to add to the list :')
"Lord Loserred once again stashing countless titty selfies from weeks ago in his phone... 😂"
My deepest sympathy to whoever was tasked with having to snap this thirst traps. I wouldn't be able to keep a straight face if my 51yo boss would peacook in front of me like that.