Unlock Boss Versions of Characters:
Clear Arcade mode on Risky with your chosen character to unlock that character's boss version. This boss that is unlocked is the version that is seen on the hardest difficulty of Score Attack. You are allowed to use 'Continues'.
Clear ALL 4 Score Attack courses on Risky with your chosen character to unlock their Navigator. Characters that were not Navigators in Persona 4 Arena Ultimax or available for purchase are unlocked this way (e.g, Labrys, Yukiko, Yukari, etc.).