Reach lvl 18 in Story Mode or Clear Latin in Ballroom Mode.
Have Kid as your partner for the Final Competition.
Reach the end of the game without becoming anyone's partner. Tony will dance with you at the ball. Win the dance and Tony will become human and say that he must return to his kingdom. He will ask you to accompany him.
Turn Tony down to unlock the "Princess" picture.
Accept Tony's offer to unlock the "Tony" picture.
Reach lvl 20 in Story Mode (Must have no partner) or Clear Standard in Ballroom Mode.
Win the Final Competition and Accept the Proposal.
Have Klaus as your partner for the Final Competition.
Have Hayato as your partner for the Final Competition.
Successfully complete the game to unlock Kiefer Bergmann, the sixth prince.
Befriend with Randy and get it from him after practice (must have no partner)
Have Cesar as your partner for the Final Competition.
Have Kiss as your partner for the Final Competition.
You can unlock the 6th Prince, Kiss after you beat the game once.
You can unlock the 6th Prince, Kiefer Bergmann (Kiss Maxgaia in the JP version) after you beat the game once.
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