Since the 2.0 update, each player has the possibility to choose one of the three classes for free ;

Tycoon : 10% more income from all money buildings, and 10% more defense from defense buildings

Agent : regain energy 10% faster (3 energy every 53 seconds)

Enforcer : regain stamina 10% faster

After choosing a class, the player can pay 150 golds to benefit from all three classes (he then becomes a "Goodfella").