There are three kinds of potential types: Human, non-Human and non-specific. Within the game, you will notice reference being made to 'humans' and 'non-humans'. This refers to the potential that a character has. If a character has both human and non-human potential, they are considered both for card effects. Characters with non-specific potential are treated as neither human or non-human unless they have other potential. Segregating the potential types in this way allows interaction between them, an ability to share traits, and also allows some to be vulnerable to effects that others are not. For example, all non-human characters may have the potential to Regenerate, so they each have access to the trait card. Humans, however, should not be weak to silver bullets and stakes etcetera.