I think that the main problem with Marinette is that she always gets blamed for minor things, but her bigger mistakes are ignored.
She also gets blamed for things that aren't her fault. Like Reverser I blame Nathaniel and his extreme expectations, and Refleckdoll, it was Alya who was making things worse for Juleka while Marinette was trying to help. Gamer's another as she did play fair and square, and won fair and square.
But yeah, ML has an issue with priorities. With the mindset that ONLY Marinette can be at fault, which has her at fault for things that actually aren't her fault or are minor things when there are bigger faults with others; and that, for Marinette's actual faults and issues, they don't focus on the actual problems.
For one thing, Marinette is a perfectionist, in her work and responsibilities, and in how she helps people. This leads to her being meddling and controlling. With good intentions but she can take it far. She even has this idea that only she can be the solution, though more in an Atlas complex way than being egotistical.
Which I'll give the show this, by how it's set up, Adrien and Marinette kinda feed this bad aspect of their dynamic into each other. Adrien goofs around as a hero or doesn't take situations seriously with his flirting at bad times, so Marinette feels like she has to step up more as leader and responsible one, and Adrien doesn't get a chance to take things more seriously or be the leader as Marinette doesn't expect him to, which leads to his frustration of not being as valued as a partner like he wants and he acts out, and Marinette sees she can't rely on him as much and it just cycles.
I know the show sorta tries to address this with the insistence that Marinette can trust Alya and doesn't need to shoulder everything, which is great, if they didn't take it back right away validating Marinette in being right in not trusting Alya.
Which man, that's one of Marinette's actual big issues, and you address it, and then take two steps back and reverse and vindicate the flawful mindset.
Another big issue is her over involving herself in this she doesn't or shouldn't get involved with, meddling included. She could do to ease back, let others solve their own problems. Like, Darkblade comes to mind (though there may be a better example). I do think it was a good episode, but you got Marinette admitting she's already busy, and doesn't want to be class rep, but steps up as no one else is. This is just an added responsibility she doesn't need but does so because she's involving herself in others problems.
This also leads into the other issue: Marinette's tendency to overpile onto her plate. They even focused on this in Gamer 2.0 but instead of doing a lesson of learning to ease up, take a break, and have fun (which Adrien could've been great for, heck, could've had them bond over a busy lifestyle); but nope, she passes Max off to her parents and continue being busy.
And of course, there's the big issue of her crush.
Like, they're 13-14 yos dealing with first crushes, they're going to be cringe and crazy as they don't know how to handle this, but they just take it way too far. And the extremes it's taken isn't even funny but concerning.
Marinette having his schedule.
The hoard of pictures.
Jealousy that spirals to extremes.
And having rose colored view of Adrien, to thinking he can never do wrong and feeling like she needs to protect and assist him, even at the risk of herself (Collector).
Part of the worst part about this is that this exists for the writers' amusement, taking it to unlikable extremes and not portrayed as really bad flaws that need to be addressed or have lessons about; which leads me to question what's the exaggeration and what can be more accurate/reasonable for the cringey, dramatic crush. Some of which could've been fine issues to fault her for and for her to get called out and learn from, but we don't get that, all we get is unpleasantness.
Oh! You could also cover Marinette's lack of prioritizing herself, and may not knowing how to take a break and have fun. Cause I don't know if this girl knows how to relax. And she definitely doesn't behave like a kid, but much older. Could even delve into the friendship problems she has not really connecting with her friends as well because she doesn't know how to be a kid, how to mess around and goof off.
Marinette has a good number of issues and flaws that can be addressed and worked with, but they pick the wrong ones to focus on.









