Is it possible these designs are all homages to people? The Warlock's hunched posture, creepy helm, and robe make him look like that Sith guy. Plus, it looks like he has lightsabers on his belt. This fits with the Stormcaller subclass where you basically become...fūck I don't know his name. Emperor Palestine. Or Plantain. It's a P something. The Hunter looks like an athlete, what with the basketball shoes and iPod. The Titan is made to resemble CoD fans...because let's be honest, he looks dumb as shit.