I misread Marinette’s superhero name as “Multimouse” and started theorizing that maybe the Rat Miraculous’ power is to make copies of yourself (kinda linked to how quickly rats and mice repoduce), but then it turned out it’s “Mulmouse”

The kwami is called “Mullo”, which seems to be in reference to “mulot”, the french word for “field mouse”, so that’s probably where Marinette got the name idea (kinda like how Chat Noir’s name in the english dub is “Cat Noir”, mixing english and french together)

Still, we’re not any closer to figuring out what the Rat Miraculous’ power could be, but on a side note, in the Chinese Zodiac, rats are considered symbolic of success, ambition, kindness, and resourcefulness, all of which suits Marinette pretty well.

I want Marinette to get the Miraculous because the other members of Team Miraculous (excluding Chloe maybe) suggest giving one to Marinette since she would be such an amazing super hero, or because Ladybug gives the task of finding holders of some of the Miraculous to Chat Noir, and he decides to hand the first one to Marinette.

Or maybe you could kinda combine the two, and have Ladybug wanting to give the Miraculous to Adrien, who says something like “Oh, I wouldn’t make a good hero! I’m too busy with my schedule. You know who you really should give that Miraculous to? My great friend, Marinette! She would make the perfect superhero! She’s so kind and smart and helpful!”

And then, now that it seems like Adrien’s going to think that Marinette has a crush on Chat Noir, it could make for some interesting dynamics with Chat Noir knowing that Mulmouse is Marinette, but Marinette not knowing that Chat knows, and it’ll give Chat a chance to see the Ladybug side of Marinette and realize that he has feelings for her!