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Flavio originally appeared as the default Mii for the Roaming Gourmet 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, Flavio 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 Gourmet.charinfo.
His Mii name in his Mii data file is びしょくかk, which translates to "gourmet k". His height is set to 84 and his build is set to 127 (maximum). His Mii ID is as follows: D6 5A 61 6E A0 3B 44 90 8B 0F 9C 41 14 53 08 2A
His Mii data file does not contain any unused Mii data.
Flavio's role in Miitopia (the Roaming Gourmet) is described as so:
A critic in search of the choicest
eats. Has strange tastes in food.
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 Flavio 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. Flavio's name on the Mii Library is going off of the US English version, for consistency. A chart containing all of Flavio's names is located at the bottom of this page.
Flavio unfortunately does not appear in any promo art. In the demo version of Miitopia (Switch), he also never actually appears in the story, and only appears once in the casting screen. Below is a screenshot of him in-game as his role in Miitopia.
While Flavio himself does not appear in any official promo art, a very similar Mii does appear in promo art for Miitopia (3DS), where he's given the Chef job.
Are the images not appearing? Let me know!
US English: Flavio (a pun on the word "flavor" - could also be a reference to the character from Paper Mario: The Thousand-Year Door with similar hair to the role, who's the editor for the Foppish Gourmet Weekly in that game)
US French: Goustan
US Spanish: Sibarito
EU English: Flavio
EU Dutch: Sjef (pun on the word "chef)
EU French: Goustan
EU German: Gusto
EU Italian: Flavio
EU Spanish: Sibarito
JP Japanese: グルメール (Translates to "Gourmer", pun on the word "gourmet")
KR Korean: Flavio
CN Chinese: Flavio
TW Chinese: Flavio
Source: Miitopia (Switch, Demo)
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 Flavio's Mii Studio code:
04007f0308040201030d030404040203090000030701000804000a0400375404000214031304080c030408030a09
You can download Flavio's charinfo-format Mii data file here.