Unlock the following bonuses by performing the corresponding tasks:

Geffen - Find the Blacksmith after defeating Giant Elder Willow and access it via West Prontera Field.
Juno/Yuno - Meet with the Scientist and access it via Airship option on the Prontera Kafra.
Lighthalzen - Access it via El Mes Plateau.
Morocc - Complete the Coal Mines, have Viseruk join your party and access it via Sograt Desert (Southwest of East Prontera Field).
Prontera - Defeat Mastering and access it via East Prontera Field.