Sanford is a Mii from the Switch.
Sanford originally appeared as the default Mii for Elven Retreat's Fab Fairies Fan 3 role in the files of Miitopia (Switch, Demo), but unused within the demo itself. He later appeared in the full game of Miitopia (Switch). Once the player replaces him with a Mii of their choice, Sanford 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 Town02_FanThird.charinfo.
His Mii name in his Mii data file is さんごうk, which translates to "fan three k". His height is set to 40 and his build is set to 31. His Mii ID is as follows: E2 74 5F 8A A8 E9 4B 9E BE 4C A0 B4 89 87 22 CD
His Mii data file does not contain any unused Mii data.
Sanford's role in Miitopia (the Fab Fairies Fan 3) is described as so:
A member of the Fab Fairies fan club.
Loves the youngest sister's antics.
The names of the default Miis in Miitopia Switch often vary drastically depending on region. Sanford's name on the Mii Library is going off of the US English version, for consistency. A chart containing all of Sanford's names is located at the bottom of this page.
Sanford unfortunately does not appear in any promo art. Below is a screenshot of him in-game as his role in Miitopia.
This Mii originally appeared on the Switch!
Here's how to recreate them on the Switch:
Names in other languages
US English: Sanford (pun on the Japanese word for "three", being "san", referencing his role "Fab Fairies Fan 3")
US French: Tristan
US Spanish: Fancesco
EU English: Chris
EU Dutch: Cem
EU French: Tristan
EU German: Christian
EU Italian: Carlo
EU Spanish: Fancesco
JP Japanese: スリッポ (Translates to "Slippo")
KR Korean: Sanford
CN Chinese: Sanford
TW Chinese: Sanford
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 Sanford's Mii Studio code:
You can download Sanford's charinfo-format Mii data file here.