"Vos" in Spain and Mexico

Tú is formal in Costa Rica and Argentina because it sounds foreign and archaic, just like Vosotros.

In Argentina the formal pronoun is usted.

What does an Argentine accent sound like to Spaniards and Mexicans? Pleasant/unpleasant? Hard/soft? Upper-class/lower class? Funny/Not funny?

But Franco, would you actually do anything about it if a stranger like moi were to address you as tu to your face? It's like how you don't actually express your views about people you don't like in public.

<<What does an Argentine accent sound like to Spaniards and Mexicans? Pleasant/unpleasant? Hard/soft? Upper-class/lower class? Funny/Not funny?>>

Well, it sounds hmm... Argentinian, some people like it some don't, I don't think there's a general perception to it.

We Spanish find it circusesque.

Argentinians from around Buenos Aires zone tend to speak the Spanish language with a resemblance of Italian accent, ( not the case of Northern Argentina), and stressing, emphazaising all verbs in the last syllable always "agudo" accent sounds and pronouncing Y and LL as "SH",or "ZH" , don't know if they want to deviate purposly from the rest of Hispanoamerica during time, or because the Italian influence since 19th century. Sounds softer.........

We Spanish find it circusesque.
/Like Algo Pequeñito video?

Argentinian dialect sounds femenin
French and Italian sounds femenin
Inglish is for gays, sounds "gay"
German and Mexican is for Man!!

Italian "looks" more femenin than it sounds because Italian speakers move a lot their hands while they talk. It gets me nervous.

Just curious,

1) was vos originally the singular version of vosotros in mainland Spain?

2) is vosotros used anywhere in Latin America where they use vos?

Vosotros is not used anywhere in Latin America.
It's absent in Canary Islands too.