To help you play WonderKing much better, we collect some useful information on Unnecessary for choosing its Class, if you have interests, just read them and get the points you need. Hope you enjoy reading it.
Knights, the class that save money, high defense, high HP, and very good HP regain allows you to save a lot on HP potions. And if you got 4:1 Vit:
Gunner, this class is not big in the damage department but they get some awesome looking skills (WonderKing zed), and their ranged so if you can play them right, you can save on Hp potions with them as well. Most of their attacks hit mobs, but it might not be a very good mix because of their low damage.
Archer, many like the Gunner class, but they are the power house of the Scout advancement. They are the Berserkers of the archer world, great damage. They also have a skill that fires several arrows at a fast pace, therefore their speed/dps is also quite good. And they summon animals like Eagles, Wolves, and bears, and again they are ranged so you can save on hp potions. Honestly you do not know a lot about Archer, since you never played one in either the CBT, OBT, or even now in the Official Launch.