(By appearance in that nation, not their nationality)
Mondstadt: Albedo
Liyue: Xingqiu
Inazuma: Kazuha
Sumeru: Tighnari
Fontaine: Furina
Natlan: Ineffa
Nod-Krai: tie between Sandrone, Columbina and Durin
Snezhnaya: Mitya (so far)
@starrylavender.bsky.socialName ONE of your favourite character in every region:
Mondstadt: Lohen
Liyue: Zhongli
Inazuma: Azato
Sumeru: Dottore
Fontaine: Neuvillette
Natlan: Capitano
Nod-Krai: Flins/Rerir
Snezhnaya: So far Vesna!