FF characters are which job?

[Lambdafish]

Sooo... for my two favorites: (I try to take weapons and playstyle into account)

FFX Rikku - either a ninja or a monk - I would go for ninja: very fast&stealing abilities. True, she got fists as weapons but I can easly imagine her with two blades aswell... taking into account that shes technically trained she might be a MCN too (even though I'm totally unsure about this, since I havent played MCN yet)

FFIV Rosa - ofc, the lady is a whm...

I want to add to this that Rikku is primarily a chemist (not a job in this game, but is a job in the series) as her overdrive is mix, and she specialises in using items, but you are along the right lines of ROG/NIN as she steals things (ROG being this games thief) and uses fast attacks.

Also Rosa is stated as being an White mage AND Archer

though lets try this for FFVI (quite easy as a lot are already given jobs)

Terra - BLM
Locke - ROG
Edgar - MCH
Sabin - MNK
Cyan - Samurai (but as its not in the game, I would have to reluctantly have to give it to DRK for playstyle)
Gau - Blue mage (nothing else fits)
Celes - PLD
Setzer - Gambler (the closest to RNG this game gets is MCH)
Shadow - NIN
Strago - Blue mage (nothing else fits)
Mog - Dancer (though BRD might fit)
Umaro - WAR

uncategorisable
Relm - Pictomancer apparently, doesn't relate to this game at all
Gogo - Mime, same thing