Maria (Switch) originally appeared as the default Mii for the Nintendo Fan role in Miitopia (Switch, Demo). She later appeared in the full game of Miitopia (Switch). Once the player replaces her with a Mii of their choice, Maria 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 Amiibowoman.charinfo.
Her Mii name in her Mii data file is にんてん, which translates to "Ninten". Her height is set to 67. Her Mii ID is as follows: 65 03 B4 C9 8D D6 4A FE B5 A7 B6 74 40 C4 01 0F
Her Mii data file does not contain any unused Mii data.
Maria (Switch)'s role in Miitopia (the Nintendo Fan) is described as so:
The names of the default Miis in Miitopia Switch often vary drastically depending on region. Maria's name on the Mii Library is going off of the US English version, for consistency. A chart containing all of Maria's names is located at the bottom of this page.
Maria (Switch) unfortunately does not appear in any promo art. Here 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)