ranking souls

I decided to rank souls as way to help new players decide which ones are the best chance to collect a specific character.
Ranked from lowest to highest chance.

Normal soul: a 1 to 3 star character.
Rare soul: a 3 star to 5 star.
Event soul: a 3 star to 5 star, but weighted to have a higher rare chance of the event character.
Class soul: a 3 star to 5 star of a certain class.
Heroic soul: a 3 star to a 5 star, with certain characters available in a rotation.
Legendary soul: a 4 star to a 5 star any class.
Class specific Legendary soul: Pull a 4 or 5 star of a certain class.
Mythic soul: 5 star any class.
Class specific Mythic soul: 5 star of a certain class.
Specific character soul: guaranteed that character.
In my opinion the most valuable easiest obtainable soul is the heroic soul. It limits the pool of what you draw from to just a few characters in a rotation, and also allows a chance of characters not obtainable any other way.