Alright, you know what, I have a thought for the Batbug stuff I’ve seen circulating; figure I’d give my own twist on it.
Marinette doesn’t go to Gotham, the bat (lower-case; its not Batman) comes to Paris. And it’s not Damien, cause...well, I have no idea how Damien/Marinette stuff started but I like Jason as a character more, so let’s go with him instead.
And, to deal with trying to reconcile DC bullshit with the semi-defined world of Miraculous Ladybug?
Sorry Jason, gonna steal a semi-common trope and had you get caught in range of some portal.
(Sometime in the early days of wearing the Red Hood, because comics timelines are bullshit but farther down then that does weird age things; with this I can age her up a year or three and have things scan well, but not wanting to do ‘Adult AU’.)
Mid-Gotham underworld takeover - or at least carving out his own section - Jason accidentally damages some superscience or magical artifact wielded by some hired gun, and falls out of Gotham (and his world entirely)
Waking in ML Paris, a quick websearch reveals there’s no Gotham, no Batman, and Justice League
However, the city is home to a new ‘wave’ of superheroes, the phenomenon being a thing on that world if much more uncommon than his homeworld
So, Jason puts the skills he’s got to the test to track down some organized crime or other sketchy figure, beats some money out of them, and finds someone to forge him an identity if not outright hacking some new documents into this world’s less-advanced systems.
Then, midway through putting his helmet on and strapping on the guns, he thinks on what it means to go on a crusade of vengeance in a city that’s not Gotham, with no Bat around to prove wrong, and has a mild breakdown
(A major part of which is caused by him being seemingly stuck in another world, but ‘what to do without a cause that was driving him’ is the other major part.)
After a nebulous bit of time where he aimlessly loots organized crime - “A vigilante!″ by newspaper’s shocked explanations, but rather low-effort compared to his home’s standards - he decides to try and figure out what a normal life is.
He’s going to try and be a normal teenage boy, never murdered and never raised to fight crime and never taught to kill. Normal, damn it!
So, he applies to work at a bakery.
And thus we still have a relationship square, no there is no freedom from the square in this fandom!