The Hero Roster is displayed when you tap the button labeled "Heroes".  It is a list of all heroes that you currently posses.  It is also from here that you may edit your teams.  (Check out the Teams page for more information on team loadout and strategy.)

Hero Roster size is determined by both your Player Level, as well as if you have purchased any additional slots or not.  You acquire 5 additional roster size at each of the following levels:  2, 4, 7, 10, 13, 17, 21, 26, 31, 36. This means that at level 36 you are guaranteed to have a total of at least 70 hero slots.  After level 36, the following chart applies:

Level 30+ Roster Growth
Level Increase
41 2
43 2
45 2
50 2
52 1
54 2
58 5
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