Successfully complete all twenty episodes in story mode. The versus mode option will now be unlocked at the main menu. You can play as Vineuvail, Zerumo, Lyserg, Heckel, Tao Len, Faust VIII, Ruby, Kanna, Lee Pai Long, Trey, Zaua, Meril, Rio, and Yoh. You also get one random secret character, such as Silva or Zeke.