Verrrrry good post!! :D This is very helpful!
Also, a few more things to add that might be interesting, in case:
æ”·ć€ăăč/ForeignMas/Internationalmas personalities are different than regular Submas, as Neko mentioned. The most obvious is that the English submas are a lot more wild/delinquent/loose (depending on whoâs asking) in their personalities, which is why they have piercings, messier hair, smoke and drink, are a little more relaxed on their jobs, etc. And they are more often lately being drawn as taller than regular submas.
Ingo and Emmet sometimes have green eyes, sometimes blue. Usually Capo Metro have brown eyes, sometimes they have brown hair too. Chef and Meister often have blond hair also (sometimes Chef Metro have curly blond hair), and Jefe Metro usually have the brown hair (sometimes sexy curly hair!).
source
Iâve never seen Korean or Chinese Submas drawn either. ;_; Bulbapedia says their Mandarin title is ć°äžé”çžœæ§ćź DĂŹxiĂ tiÄ ZÇngkĂČngguÄn. Their names are ćć° BÄishĂ ng and ćć» NĂĄnâxiĂ
ìí Sanghaeng and íí Hahaeng are their Korean names.
The Subway Bosses often visit the Subway Masters in fanart. Sometimes it even involves Animas and Gamemas too, but thatâs another story!
Relevant tags to this discussion (for those interested):
æ”·ć€ăăč or  攷ć€ă”ăăăč (foreignMas/foreignSubmas) = internationalmas. The most common, usually means the English version but sometimes others too.
ă€ăłăŽ = Subway Boss Ingo
ăšăĄăă = Subway Boss Emmet
ă”ăăăč = SubBoss (English Subway Bosses)
ăăŒăăĄăă = Chef Metro
ă«ăăĄăă = Capo Metro
ăĄăăăă€ăčăżăŒ = Metromeister