In the world of My Hero Academia, a quirk grants superhuman abilities and powers to an individual which is genetically manifested when they are at a very young age leading onto adult life. Most of the time a child will manifest either one or two of each parent's quirks based on compatibility.individuals who are licensed to use their Quirks to protect civilians from Villains, natural disasters, and/or any other kind of harm. Those who take heroism as a profession are referred to as Pro Heroes.