Draglade Codes -

Major Titles:
Complete the indicated Story mode to unlock the corresponding title.

Earth Major: Earth Hero's Story mode. 
Elec Major: Thunder Hero's Story mode. 
Fire Major: Fire Hero's Story mode. 
Ice Major: Kyle's Story mode. 
Water Major: Water Hero's Story mode. 

Shadow of Darkness bonus quest:
Successfully complete Story mode with all default characters, with the "Fire Major", "Aqua Major", "Rock Major", and "Elec Major" titles to unlock the "Shadow Of Darkness" bonus quest at Synethesia.

Fight as Asuka:
Successfully complete Daichi's Story mode to unlock Asuka in Story mode.

Fight as Gyamon:
Successfully complete Guy's Story mode to unlock Gyamon in Story mode.

Fight as Koki:
Successfully complete Hibito's Story mode to unlock Koki in Story mode.

Fight as Shura:
Successfully complete Kairu's Story mode to unlock Shura in Story mode.

Fight as Zeke:
Successfully complete all quests, including "Shadow Of Darkness" to unlock Zeke in Wi-Fi battles.