There are 4 types of hero classes in this game: green (normal), blue (good), purple (rare), and gold (epic). Heroes are used in every aspect of the game, you start out with Head Hunter(rare) and Crack Shot(good). You can get heroes with daily recruitment, resource raiding, lords league, dungeons, jewel rolls, daily login rewards and buying jewels. If you go to hero hall in game and tap "See More" you can view all the heroes and see basic information about stats.
Here are the Hero classes, click on a class to see a seperate list of all the heroes.
The "NORMAL" heroes are represented by the color green and consist of : Shock Trooper, Dead Eye, and Snifferoos.
The "GOOD" heroes are represented by the color blue and consist of : Mechanoid, Ogre Chief, Crackshot, Badbone, Shadowsword, and Battle Beetle.
The "RARE" heroes are represented by the color purplse and consist of : Hercules, Shining Wizard, Dragon Rider, Exokid, Pyro Pete, Arcane Warlock, Armored Villain, Head Hunter, and Robyn Hood.