“Average Parisian falls in love with Marinette Dupain-Cheng 3 times per year” factoid actually just statistical error. Average Parisian only falls in love with Marinette once. Face-Blindness Adrien, who cannot tell the difference between her identities and falls in love with 6 Marinettes per day, is an outlier adn should not have been counted
The best part of Adrien not knowing Marino is Marinette is that he actually DOES know that Marino is Marinette. He saw Marino get revealed as Marinette in party crasher. She comes over in Gabriel Agreste and suddenly Marino and “that one butler guy with the exact same accent but a slightly different mustache” are two different people
adrien is having a hard time figuring out his love problems, and decides to draw up a tournament bracket to organise his thoughts. he thinks the wise thing to do would be to flip coins between everyone in each bracket through to the end stages, and then romantically pursue whoever wins best of three in the final showdown.
he puts down some expected names such as kagami, ladybug, and marinette, and some less-likely names in luka, wayhem, and nino, as well as a bunch of other people nobody have never even heard of ("i heard marinette has a cousin named germaine? and i needed to fill that spot, so"). he asks alya to take the minutes of his attempt, and she agrees on the sole condition that if nino makes it to the finals, adrien picks the other person instead. she doesn't want to push the idea of marinette too hard - besides, she already knows that marinette is on the list three times (as ladybug, marinette, and multimouse), so she thinks marinette has a pretty good shot at it.
the finals end up being between nino and some other guy alya's never heard of. she's sad for marinette, of course, but she doesn't want to give anything away on marinette's behalf, either. so she squints at the bracket and asks aloud: "who's... marino the waiter?"
E3 Cat noir and Marino. The idea of Cat noir being kissed by (totally not Marinette in a mustache with a bad accent) and being confused but into it; is the kind of stuff that starts fanfics.
i honestly dunno if i did this concept justice but ya