Sooo... for my two favorites: (I try to take weapons and playstyle into account)
FFX
Tidus - probadly a ninja, I'd say: fast, mobile, using a blade (I'm sorry, but I disagree with him being an archer :P even though hes got a very fine hit-rate aswell)
Wakka - archer: applying various status-effects on monsters (first moves he learns if you follow his path), being ranged, having a very good hit-rate
Auron - DRK: one handed sword, heavy attacks while also a good pool of HP. Hes also the first one to learn some "cover"-spell, which would make him a paladin... but... naaaah... he doesnt seem like one so I identify this as a tank-ability
Kimahri - DRG: spear, jump, you dont want him in your party (sorry, had to make this joke xD actually its pretty clear though that hes a dragoon/bluemage - but since we dont have a bluemage yet...)
Lulu - easy, shes a BLM
Yuna - bit though... shes a SMN/WHM - clearly shes the healer in your party, learns all that nice, stronge healing-spells (and holy!) but can also summon aoens... you can even compare them to our egis I suppose... so: shes job switching and leveled two jobs! (And yes, she can do that mid-fight!)
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 (this is a lot easier!)
Cecil - hes a paladin - the paladin: sword&shield, cover, low level white magic (and ofc: DRK in the beginnig... its even called that)
Kain - dragoon - nough said, I suppose? I mean - our dragoon armor was modelled after him xD
Rosa - ofc, the lady is a whm...
Rydia - SMN - we can discuss that she was an arcanist early in the story and picked up her soul crystal later
Edge - Ninja, if you know the game no discussionen needed... two blades, ninjutsu, being called that...
Yang - Monk
Tellah - hes a bit of an exception since he knows mostly every spell ingame (but doesnt has the MP to use them...) - maybe a BLM who doesnt knows about his stances...? Or a WHM whos constantly running ooM? I would say: hes a BLM for me since I'm always using him like one...
Palom - (might be called differently in english?): hes the little BLM, done
Porom - (again, maybe different name): Paloms twin-sister, shes a WHM
Cid - a warrior, decent HP and his hammer isnt to far away from an axe, right?
FuSoYa - again, bit tricky... if I remember correctly he was able to cast black&white magic alike... so... BLM again?
Edward - hes a bard (and probadly the reason why no one likes bards now...)
Also, as a sidenote for FFII - would have loved to make such a chart for that game too! But since every character in there can become what he wants thats a bit off-limits. Same goes for FFIII and FFV - both are having a jobsystem, so its up to you which job each of your characters is mastering... for FFI such a chart is useless aswell since you're picking your characters based on their class.