Unlock the following characters by completing the corresponding floors and then obtaining the required card to unlock the lock panel:

CHARACTER - HOW TO UNLOCK
Bomber - Open the lock panel on Bifrost Floor 6 and defeat him in a duel.
Bruno Borreli - Complete Niflheimr Floor 4.
Dark Signer Carly - Open the lock panel on Yggdrasil Entrance and defeat her in a duel.
Dark Signer Demark - Open the lock panel on Bifrost Floor 4 and defeat him in a duel
Dark Signer Kiryu - Open the lock panel on Bifrost Floor 7 and defeat him in a duel.
Dark Signer Misty - Open the lock panel on Bifrost Floor 7 and defeat her in a duel.
Dark Signer Rudgar - Open the lock panel on Yggdrasil Floor 2 and defeat him in a duel.
Sherry Leblanc - Complete Niflheimr Floor 2. 

Unlock the following opponents and their deck recipes by performing the corresponding tasks. Note: You do not have to purchase their Deck recipes in the Shop before the corresponding opponent is unlocked.

OPPONENT - HOW TO UNLOCK
Andre - Complete Niflheimr 12F.
Breo - Complete Niflheimr 14F.
Bruno Borrelli - Complete Niflheimr 4F.
Elsworth - Complete Niflheimr 10F.
Jakob - Complete Niflheimr 20F.
Jean - Complete Niflheimr 16F.
Lawton - Complete Niflheimr 8F.
Lester - Complete Niflheimr 6F.
Primo - Complete Niflheimr 18F.
Sherry LeBlanc - Complete Niflheimr 2F.