Z-Souls are special trait that each character has and each one is different in its own way. You choose one at the start of character creation and gain the benefits of it. There may be times during the game where your soul begins to turn, twist or take shape into a completely different Z-Soul. What you do and how you act throughout the game can help make these changes manifest. When creating your character choose one of the Rank 1 Z-Souls that might best represent your characters style or personality.