Sophie (Switch) originally appeared as the default Mii for the Great Sage role in Miitopia (Switch, Demo). He later appeared in the full game of Miitopia (Switch). Once the player replaces him with a Mii of their choice, Sophie would never appear again, unless that Mii is deleted. His Mii data file can be found in \cmn\storedata\npc_default_mii.sarc and is named Sage.charinfo.
His Mii name in his Mii data file is けんじゃk, which translates to "sage k". His height is set to 124 and his build is set to 20. His Mii ID is as follows: DC 0B D3 DD CF FE 43 55 8F 6A 5D C8 5D C6 E2 46
His Mii data file does not contain any unused Mii data.
Sophie (Switch)'s role in Miitopia (the Great Sage) is described as so:
A wise and powerful mage who
roams the world helping others.
He 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 Sophie (Switch) 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. Sophie's name on the Mii Library is going off of the US English version, for consistency. A chart containing all of Sophie's names is located at the bottom of this page.
Sophie (Switch) unfortunately does not appear in any promo art. Below is a screenshot of him in-game as his role in Miitopia.
While Sophie himself does not appear in any official promo art, a very similar Mii does appear in promo art for Miitopia (3DS), where they're given the Great Sage role as well.
This Mii originally appeared on the Switch!
Here's how to recreate them on the Switch:
Names in other languages
US English: Sophie
US French: Sapius
US Spanish: Tolosé
EU English: Brian (pun on the word "brain", referencing how the Great Sage is very smart. Additionally, JP Japanese's original name is similar, making this reference likely)
EU Dutch: Wijsbrecht
EU French: Sapius
EU German: Luca
EU Italian: Savio (pun on the word "savior", referencing how the Great Sage saves the player when he's first introduced)
EU Spanish: Tolosé
JP Japanese: インテロ (pun on "intelligent")
KR Korean: Sophie
CN Chinese: Sophie
TW Chinese: Sophie
Source: Miitopia (Switch, Demo)
Mii Studio code
Unfortunately, as the Switch no longer supports QR codes, the only way to obtain this Mii yourself directly is via importing them into your Mii Studio with this tool.
This is Sophie (Switch)'s Mii Studio code:
You can download Sophie's charinfo-format Mii data file here.