The following characters become unlocked in the game when you meet the indicated requirement.
Unlock Royal Guard:
Complete the game as Green Knight.
Complete the game as Red Knight.
Complete Icy Arena offline.
Beat the game with the Barbarian
Unlock Black Knight:
Beat the game with the Grey Knight
Beat the game with Mechanic
Unlock Mechanic (Gear Knight):
Beat the game with the Blue Knight
Beat the game with the Red Dragon Knight
Unlock Red Dragon Knight:
Beat the game with the Orange Knight
Beat Thieve's Arena
Beat King's Arena
Unlock Grey Knight:
Defeat the Barbarian Boss
Unlock Alien Hominid:
Have the full game of Alien Hominid HD on your Xbox 360 HDD.
Added by: Sanzano Aug 29th 2008, ID#3021