Well since I've decided to start on both the drawings and the official fan fiction of Equestrian RPG, I thought I'd use classes that's relative from Final Fantasy and other hot MMO games or elsewhere and I've come across a few gaps as to which class/job suits each pony.

Here is the list of the Mane 6 ponies and their classes:
Twilight --> Black Mage
Fluttershy --> White Mage
Spike --> Master Thief
Rarity --> Empress Of Light
Applejack --> Gunner
Pinkie Pie --> Bard and Juggler
Rainbow Dash --> Dragoon (still being decided)
*Their descriptions and details will probably be told in the story, and yes, they do advance in their classes occasionally throughout the story*

So that's pretty much the line up, but what classes would you guys/girls make them?
>>>Princesses and background ponies are still in progress as well!<<<

Does this help?

Pinkie: Bard
Twilight: Elemental Mage
Rarity: White Mage
Fluttershy: Beastmaster
Applejack: Warrior
RD: Scout/Rogue/Light Warrior depending on what you're playing.

Pinkie: Ninja
Applejack: Knight
Twilight:Black Mage
Rainbow Dash:Black Belt
Rarity:Red Mage
Fluttershy:White Mage

All of these are classes from Final Fantasy I.... just to let you know.

Twilight - Red Mage/Scholar.
Applejack - Warrior/Fighter.
Fluttershy - Beast Trainer/Ranger.
Rarity - Gun Mage/Geomencer.
Pinkei - Songdress.
Rainbow - Thief/Fighter
Celestia - Paladin.
Luna - Dark Knight.
Zecora - Alchemist.
Shinning - Knight
Cadance - White Mage.
Chrysalis - Mime.

Trixie - Black Mage.
Applebloom - Engineer.
Sweetie Bell - Bard.
Scootaloo - Dancer.

Discord - Gambler.
Gilda - Warrior/Berserker.

Time for some Pathfinder/D&D!

Twilight - Sorcerer (Bloodline: Arcane)
Applejack - Monk (Archetype: Martial Artist)
Fluttershy - Ranger (Archetype: Beastmaster)
Rarity - Sorcerer (Bloodline: Arcane)
Pinkie Pie - Bard (Possible Archetypes include: Celebrity, Magician, Daredevil, Street Performer, & Songhealer)
Rainbow Dash - Nomad

Applejack as a Warrior, Dash as a rogue, Twily as a mage, Fluttershy as a druid, Spike as a Paladin, Rarity as a Priest, Pinkie Pie as a monk, Luna as a death knight, Celestia as a Priest, Sombra as a warlock, Chrysalis as a warlock/druid hybrid, and Discord as a game moderator.