The class your character gets is based on their gender and main stat.
Male :
STR: Duelist
DEX: Gunslinger
INT: Dragoon
Female:
STR: Magilancer
DEX: Mirage Caster
INT: Sorceress
I also note this CrazyErich fellow has a wizard level of ten million. Even if you played this game 24/7 from when it came out, there's no way you could get that high.
 "Ray Quest")
 "Hello Worlds!")
 "Copy Cat")
 "The Prinny Land Induction Test")
 "Valthirian Arc")
 "REPLAYING :the game:")
 "Age of Information")
 "Obey the Game")
 "shrink it")
 "Frontier")
 "The irRegularGame of Life")
 "TETRIS'D: The Game")
 "Ayumilove HackerStory V1")
 "Hackerstory")
 "Red Remover")
 "How to Raise a Dragon")
 "GemCraft chapter 0"){kind=icon}
 "SHIFT 4")
 "Learn to Fly")