You need to go at Create Character option on the bottom half of the Getamped main menu screen and to click OK. A detailed game character editor will be opened. You can give your character a name and you can select a fighting style from 29 possible fighting style. Also you can edit the head, the body and the face of your character and you can add an accessory (a cigar, a pair of gauntlets, a gun) to your character outfit.