When you first register for GoodBlox, you get a "Character" that is used to visit places on GoodBlox.
Your character represents you in-game. When you Visit a Place you pop into the place and move about as your Character. The character model is two legs and arms, a torso and a head. Each of these pieces are blocks that allow you to make around. Removing your "Head" or "Torso" in-game, will cause your health to drop to 0, and you will gain a wipeout.
Each piece of a character can be customized into 32 different colors. Not only can you customize your character's color, but you can also place hats on your character's head, wear t-shirts and Shirts, and wear pants just as well. Each of these different kinds of "clothing" can be found in the Catalog.