The Hero Association, also known as the Superhero Society, is an organization founded by the multi-millionaire Agoni that manages all of the cities' superheroes. Agoni has also established the National Superhero Registry, the database that embraces every recognized superhero. The Association uses a class-system, with 4 classes and ranks within those classes, to organize every superhero accordingly.


There are four classes for Heroes, with C-Class being the weakest and S-Class being the strongest:

   - S-Class, with a total of 17 heroes
   - A-Class, with a total of 38 heroes
   - B-Class, with a total of 101 heroes
   - C-Class, with a total of 390 heroes 

Thus there are a total of 546 heroes. To go to the next class up a hero must be ranked #1 in their class, at which point they can choose to stay at the top of their class or start at the bottom of the next class, or, such as with Genos a hero can be put directly into a higher class if their score on the registry test is high enough.