There are various merits in the game you can obtain by doing certain tasks or completing certain goals. Anyone familiar with game achievements will know what kind of things to expect. Each time you complete a merit you get ollars (currency) which you can use to buy avatars.
I have been playing Super Scribblenauts a lot lately and its a lot of fun. I will probably write more Scribblenauts stuff in the future and maybe do a review. In the meantime these are the adjectives I have found so far. I will add more when I find them or you can yet me know if you discover more.