VII, VIII and X: what are their classes?

[Lacarus]

Red Mage because he's strong physically and magically (comes equipped with Fire) and has no other discerning features.

I see your point.

Only in the same way it would make Tifa a Gambler. Wakka's role is determined more by his long range attacks and status abilities than the Overdrive visuals.

I forgot about Tifa's reels. Another thought that ran through my mind considering Wakka, is that he has the look of a munk, although he doesn't act like one at all. I don't have a point with this, just a thought.