Pko is a wonderful game where its not only adventure, you gain alot of friends in the process of playing.. Chances are, u will loss ur motivation after u reach a certain lvl, but the one that makes u keep going will be ur friends in this game! Thats what that make this game so nice and unique and make me continue for 3 years. The coolest class to choose will be Voyager.. although sky angel at the top post mentioned the difference between each class and is very accurate also.. A Newbie that choose voy will find that its true although u cant be killing people all the time unlike cruz, voys are the best class when u feel happy with all the sea explorations.. Try it!