From the introduction:
Everyone loves dice. We love them because they push the action
along into often unexpected places, inspiring us to create more exciting stories. So why aren’t the dice a part of creating hero data- files in MARVEL HEROIC ROLEPLAYING? Surely there’s a way to let the dice shake things up before the game even starts. Great news, True Believers! With this bonus content, there is.
The original Marvel Super Heroes RPG from TSR had three ways to choose a character: pick one of the character cards included in the game, model an existing character idea or concept by assigning stats and powers, or break out the dice. The MARVEL HEROIC ROLEPLAYING Operations Manual includes the first two. But we know how much fun random generators can be, so we decided to make that third option a reality.