Successfully complete the indicated task to unlock the corresponding cast appearance:

Commando Cast: Successfully complete Commando.
Exed Exes Cast: Successfully complete Exed Exes.
Final Fight Cast: Successfully complete Final Fight.
Forgotten Worlds Cast: Successfully complete Forgotten Worlds.
Ghosts 'n Goblins Cast: Successfully complete Ghosts 'n Goblins.
Ghouls 'n Ghosts Cast: Successfully complete Ghouls 'n Ghosts.
Gun.Smoke Cast: Successfully complete Gun.Smoke.
Mercs Cast: Successfully complete Mercs.
Pirate Ship Higemaru Cast: Successfully complete Pirate Ship Higemaru.
Street Fighter II Champion Edition Cast: Get over 300,000 points in Street Fighter II Champion Edition.
Street Fighter II Cast: Get over 200,000 points in Street Fighter II.
Son Son Cast: Successfully complete Son Son.
Super Ghouls 'n Ghosts Cast: Successfully complete Super Ghouls 'n Ghosts.
Trojan Cast: Successfully complete Trojan.
Vulgus Cast: Defeat Vulgus.