A Complete list of Each Possible Class in MapleStory 2

Explorers

Fighter (Warrior)
Page (Warrior)
Spearman (Warrior)
Fire/Poison Wizard (Magician)
Ice/Lightning Wizard (Magician)
Cleric (Magician)
Hunter (Archer)
Crossbowman (Archer)
Bandit (Thief)
Assassin (Thief)
Gunslinger (Pirate)
Brawler (Pirate)

Cygnus Knights

Dawn Warrior (Warrior - Fighter)
Blaze Wizard (Magician - almost Fire/Poison, without Poison)
Wind Archer (Archer - Hunter)
Night Walker (Thief - Assassin)
Thunder Breaker (Pirate - Brawler)
Mikhail/Milhile (Dawn Warrior, KMS and GMS)

Resistance

Battle Mage (Magician - unlike anything, uses Staff)
Wild Hunter (Archer - Crossbowman, but mounted)
Mechanic (Pirate - Gunslinger technically, very unlike Pirates, unique, mounted)
Demon (Warrior - comes in 2 paths: Demon Slayer and Demon Avenger. Demon Slayers use HP and DP for attacks, and use 1 handed axes and maces. Demon Avengers uses a special sword and HP consuming moves.)
Xenon (Thief/Pirate hybrid - uses Energy Sword, uses STR + DEX + LUK, bonus Surplus Supply system)

Hero

Aran (Warrior - uses Polearm, exclusive combo system)
Evan (Magician - unlike anything, uses a dragon)
Mercedes (Archer, uses dual crossbows)
Phantom (Thief, uses cards and a cane)
Luminous (Magician, uses a shining rod, orb and light/dark magic, KMS only)

Dual Blade

Dual Blade (Thief - Bandit that wields Katara as well as dagger)

Cannoneer

Cannoneer (Pirate - Gunslinger who uses a cannon instead of a gun)

Nova

Kaiser (Warrior - Aran, uses a two handed sword, Dragon's Soul, a combo system and can transform into a dragon)
Angelic Burster (Pirate - uses a cannon/gun hybrid weapon)

Exclusive Classes

Jett (Pirate - Gunslinger with a science fiction twist, GMS only)
Dragon Warrior (Pirate - Similar to Jett but with different animal-themed animations and also uses summons. CMS only)
Hayato (Warror - Samurai class who uses two handed swords, JMS only)
Kanna (Magician - Shrine Maiden class who also can summon foxes, JMS only)
Shade (Pirate/Magician Hybrid - Uses mainly knuckles as primary weapon and Fox Marbles as second weapon, The only character who could go through the Middle Door at the Temple of Time)
Beast Tamer- Chase (Magician- of the beast tamer class, powers from several animal creatures: Cat, Snow Leopard, Bear and Hawk)
Zero (Warrior/Magician Hybrid - Child of Rhinne, The Transcendence of time, separated in to two by the Black Mage: Alpha(male), Beta(female) and imprisoned into the mirror world. Instead of using Mana, Zero uses Time Force (TF))