Complete the following requirements to unlock the desired character in Free Play.

Unlockable	How to unlock
Altera (Saber)	Complete Tamamo's (Caster) Main Story.
Karna (Lancer)	Complete Tamamo's (Caster) Main Story)
Medusa (Rider)	Complete the First Stage in Tamamo's Main Story.
Nameless (Archer)	Complete Nero's (Saber) Main Story.
Tamamo no Mae (Caster)	Complete Nero's (Saber) Main Story.