We go through levels by using types of classes. As the levels progress downwards the higher the level of the person
You do not choose these. Levels are based on how much you are around, how you fight, how many times you fight, your speed, and how much of a margin you win or lose by. Warning you can go down in levels though.
Levels:
Newbie: The new guy, not really powerful
Junkie: An oldie but STILL weak and slow
Officer: Somewhat skilled but still swaying on the weak side
