If you’re completely new to Wakfu, be sure to check out the Player VS Wakfu: Introductory Guide!
Fire Wakfu Cras are awesome.
Seriously, they can be pretty darned cool. Wakfu Cras are designed to be ranged players, also known as rangers in many other games. Keep this in mind if you’re choosing a Cra. If you want to hit somebody in the face with a sword choose a different class. If you want to shoot things and have them die before they get to you, then Cras may be your cup of tea.