i like to think Marinette is really skilled at cake decorating. it's a different artistic medium but one she picks up quickly and finds very relaxing. she LOVES piping intricate designs and making realistic gumpaste flowers. it's calming to her. whenever she's stressed, Tom will ask her for her help with decorating a cake, and it instantly chills her out. she gets into the Zone.
the first time she makes Adrien a cake, he is mesmerized by the amount of detail. perfectly piped rosettes and lettering, wishing him a happy half-birthday or something of those sorts. he almost doesn't want to eat it because of how pretty it is, but they enjoy a slice together. he loves how artistic she is, and the cake tastes good too! after dating her for a few months and spending time at the bakery, he begins to become familiar with her piping style, and loves watching her make perfect droplines or buttercream roses. he thinks it's especially cute how her tongue pokes out of her mouth when she focuses. she's always showing him something new she's learned. he's aware she's amazing (his own words), yet she still always manages to surprise him.
later, when ladybug shows up to patrol with a cake to celebrate their defeat of a particularly difficult akuma, chat noir recognizes Marinette’s handwriting in the piped message on the top of the cake, and his chest warms with affection knowing ladybug purchased this cake from his girlfriend's parents' bakery.
"It's a beautiful cake," he would say, thinking of Marinette poking her tongue out as she piped the buttercream border. his love for her surely spills out in the softness of his voice, but he can't help himself. he adores Marinette!
Ladybug would be all bright smiles, beaming with pride. "Thank you," she'd respond. "I decorated it myself!"
With the second one, it's basically that they're free to tell whoever without consequence. It's purely based off their personalities (ex. Adrien probably wouldn't say anything to his father but would tell a close friend). Kind of how they do so in Sailor Moon or Cardcaptor Sakura.
Marinette and Alya redesigns!!! I want to do Adrien, Ladybug, and Chat too but I can’t draw dudes and am wildly un-creative when it come to fantasy clothes.
I think Marinette would really like taking Ballet or gymnastics to work on being a super and would pull a Gwen Stacy and wear her pointe shoes every where :)