Hero "Class"

There are four broad "classes" or sources of power in the world of Parahuman. Though many, especially Immortals, blur the line between these concepts, often combining two or even more. Don't be afraid to be creative.
Born are those who have been born with their powers. The world of Parahuman has known of the existence of those with abilities beyond normal men since the dawn of time itself. The majority of Parahumans are Born.
Experiments are the opposite of the Born. While all experiments have a latent P-Factor, they required some sort of catalyst to bring the P-Factor into full expression. Exposure to radiation, reliance on advanced technological devices or even near-death experiences can awaken the latent P-Factor and bring it to the fore.
Immortal Parahumans are considered by many to be a "sub set" of the Born or, rather, the other way around. Immortals don't age and rarely have to be concerned with things such as food or drink, though many can die through violence. Many of the ancient gods were Immortals.
Design Note If you are going to play an Immortal, you MUST take the Immortal Quirk. Without it, you aren't immortal. Many Immortals also have the Self-Sufficient Quirk as well and quite a few have the Regeneration power.
Mystic Mystics are able to call upon what many might refer to as "magic." They are capable of casting spells or summoning entities with the correct powers.
The "Fifth Class." There is a fifth "class" of Parahuman, the Alien. Beings such as the Clatishians fall into this category. When considering how powers are affected, Aliens work identically to Born in many cases.