F2P friendly class

In your honest opinion, which class is the most friendly and favorable to free-to-play players?

My only expenses will be the energy pass and the pet pass, and I don't have any money to invest in anything else. So, since I recently returned to playing on a brand new server, I want to invest my time and effort in a class that is more friendly to free-to-play players and that isn't totally dependent on the Mysticat.