Wanda is a Mii from the Switch.
Wanda originally appeared as the default Mii for Elven Retreat's Eldest Fab Fairy role in the files of Miitopia (Switch, Demo), but unused within the demo itself. She later appeared in the full game of Miitopia (Switch). Once the player replaces her with a Mii of their choice, Wanda would never appear again, unless that Mii is deleted. Her Mii data file can be found in \cmn\storedata\npc_default_mii.sarc and is named Town02_SisterFirst.charinfo.
Her Mii name in her Mii data file is えるふあねk, which translates to "elf sister k". Her height is set to 121 and her build is set to 46. Her Mii ID is as follows: 16 9C 72 F3 C5 00 40 45 B7 25 A5 08 62 9F 26 AE
Her Mii data file does not contain any unused Mii data.
Wanda's role in Miitopia (the Eldest Fab Fairy) is described as so:
She seems to bear resemblance to a Mii featured in Miitopia (3DS) promo art, as it seems a handful of the Miitopia Switch default Miis were based around Miis that appeared in promo art for the original game, but it's unconfirmed if Wanda and the promo art Mii are meant to be the same character.
The names of the default Miis in Miitopia Switch often vary drastically depending on region. Wanda's name on the Mii Library is going off of the US English version, for consistency. A chart containing all of Wanda's names is located at the bottom of this page.
Wanda unfortunately does not appear in any promo art. Below is a screenshot of her in-game as her role in Miitopia.
This Mii originally appeared on the Switch!
Here's how to recreate them on the Switch:
Names in other languages
Source: Miitopia (Switch, Demo)