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She's called Ariadne (a ref to the Sleeping Ariadne, the statue of a supposed fairy).
She's a deredere girl living in the Glimwood forest in Galar.
Her friends are all fairy-type pokemon. There's Rem (Hattrem), Mi (Mimikyu), Fay (Clefable), and Syl (Shiny Sylveon cause I'm a shiny hunter and I needed this one as a shiny at least ). Mainly because of (Do) Re Mi Fa Sol
Her mimikyu wasn't initially hers, it was Allister's the ghost-type gym leader. (Remember the first time you battle with him in sword and shield he had a mimikyu then it wasn't in his team the second time we face him)
So she's friend with that little boy, and she often visits him in the cemetery/ruins, next to the forest (or the other way around) and play with him.
She likes to read him the fairy tales she imagined and drew in her sketchbook. 🦄
When she grows up into a teenage girl, she has a famous Instagram account called @mimikyosplay where she posts her mimikyu and herself in different pokemon cosplay.