(I don't care an overt amount about which character, IC is a suggestion)
Ok so first of all, I want her gender. Peak aesthetic.
-I feel like she wants to launch her own fashion line, and dreams about the collabs she could do. Mostly Sanrio, but on occasion other properties like Bemani, Puyo Puyo, and Vocaloid get thrown into the mix.
-Even if she didn't make those clothes herself, she totally customised them. This girl is a whiz with a sewing machine.
-With customers she likes, she goes all out on the coffee art. You are getting just the prettiest drink known to man.
-A little weird, but I feel like she did self-defence training as a kid. All that physical energy transformed into cuteness when she grew up.
-Probably a Lizzo, Babymetal, and other j-pop adjacent fan.
(Sorry if these aren't that good!)