Well I love your bkdk Miraculous au and I want all the answers. What's the Love Square like?
Oh friend, buddy, pal, you're askin' a big question here that this entire AU is gonna revolve around and I just made this up two nights ago.
But I gotchu.
TLDR; Bakugou likes Midoriya, Midoriya is wary of Bakugou, Chat Noir is insecure around Bug, Bug really likes Chat Noir. These relationships evolve as time goes on.
so. This ENTIRE AU is secretly a REVERSE LOVE SQUARE AU.
cue evil laughter.
A'ight, in order for y'all to understand this, I need you to know that Bakugou actually acts like his prototype version at school, because he's heavily... encouraged by his parents to maintain a pleasant attitude, and it's something he's practiced since sometime after he stopped interacting with Mido as a kid. Helps make photo shoots go faster, keeps his reputation smooth, you know. You'd think he wouldn't care at all, right? I partially blame the fan mail; it can be really horrible (cough cough thinking of Social Media 101 on AO3)
You also need to know that Baku and Mido were childhood friends in this AU; Baku hasn't had real friends since he stopped interacting with Mido all those years ago, so Mido hasn't left his memories, and Mido has more or less moved on and actually forgotten Baku's name and face.
Mido remembers him as Kacchan, of course, and as the kid that was really mean but also really ironically charismatic, leader-like, talented, and with enough self assurance that Mido was almost jealous. For another kid his age, Baku was impressive.
So of course Mido would not recognize his Kacchan AT ALL through the pleasant, fake attitude and lack of stark crudeness. As a matter of fact, it kind of pisses Mido off just how dishonest Baku seems, and it changes the context of whatever helpful thing Baku says. Instead of seeing Baku as socially awkward and mean yet helpful, he sees Baku as manipulative and using his knowledge to make others feel dumb and make himself feel superior.
The one (1) thing that convinced tiny child Mido that Kacchan wasn't all that bad was that he knew Kacchan was always just. Honest. Honestly calling you a dumbass, honestly helping you be less of a dumbass. Baku of the current day seems dishonest and is definitely rude.
Baku, though, does remember Mido. And he likes this dude that doesn't take shit from his "pleasant" persona. Baku, like his prototype, does maintain the same sunny aura, but unlike his prototype, he tends to insult people on purpose. He tells them off for how shitty their homework is because - he very astutely and accurately presumes - they spend 8 hours every night wasting their life on games instead of studying for at least 2 standard hours. He says all that as politely as he can force himself, but he doesn't really realize that it comes out so much worse that way.
Whenever Mido recognizes this - and eventually he keeps a permanent eye out - he jumps in to amend Baku's statements to the person who's feelings had just been trashed. At first, he'd pull Baku aside and tell him how rude he's being. Then, Mido'd just glare Baku's way. Then, when Baku eventually admits his ineptitude in just trying to get some idiot to stop ruining their own grades, Mido tries to explain how important feelings are and how saying things in a certain way is hurtful. He can't explain it perfectly, though, because he's no social engineer and no therapist. It's a slow and frustrating process for both of them.
But Baku honestly appreciates it. HATES that he needs to to learn how to play nice all over again just to give people advice they should honestly be thankful for already, but appreciates the balls and willingness Mido has to actually do something instead of just sulking or sitting by when things go wrong.
He won't admit it, but it's nice reconnecting with an old friend who liked him when he didn't wear a mask, who probably maybe likes him now behind the mask because Mido hasn't called on any teachers yet or turned the class against him, even if Mido acts fed up as heck. He likes to tease Mido with tiny bits of knowledge he still has on Mido from when they were kids, like things Mido likes and fears. Though it's not always accurate, when it works he gets to see Mido all flustered. He's wondering how long it'll take the dumbass to remember him.
OH MAN AND THAT'S ONLY HALF THE LOVE SQUARE. The next segment is quicker, though.
Bug is reminded of his Kacchan when it comes to Chat Noir, who acts like himself in-costume. he defends Chat Noir vehemently whenever accusations of being another villain are thrown around, and is still pretty desensitized from Kacchan's brand of crudeness so much that he sees the good in Chat's actions.
Chat Noir is honestly incredibly pissed whenever Bug takes the lead and HATES that the ladybug and chat noir miraculouses are tied together like they are. He gets more and more angry when Bug defends him against the accusations being thrown around, but once he gets out of that delusion of his that Bug thinks he's better than Chat and that nobody can really like his asshole (true) persona, he starts to honestly appreciate it. For a while, he wondered if Bug only kept him around to keep an eye on him, like he really was a villain. It hurt more than he let on.
Beyond any of the drama, when they just get lost in each other, they get along pretty well. Patrols can be really fun and chill.