Largo is a Mii from the Switch.
Largo originally appeared as the default Mii for the Greenhorne town's Carefree Guide 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, Largo 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 Town00_Guide.charinfo.
His Mii name in his Mii data file is のんきな, which translates to "carefree" (or other similar adjectives). His Mii ID is as follows: F2 80 51 AE A2 9B 42 62 96 EC D1 89 44 BB 26 88
His Mii data file does not contain any unused Mii data.
Largo's role in Miitopia (the Carefree Guide) is described as so:
He seems to bear resemblance to Akira (Wii U/3DS), as it seems a handful of the Miitopia Switch default Miis were based around Wii U/3DS CPU Miis, but there are still visible differences between Largo and Akira.
The names of the default Miis in Miitopia Switch often vary drastically depending on region. Largo's name on the Mii Library is going off of the US English version, for consistency. A chart containing all of Largo's names is located at the bottom of this page.
Largo 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
Source: Miitopia (Switch, Demo)