MechaTarrasque
Hero
Maybe the question should be "is the warlock really a mage?" The 'lock can do a lot of neat stuff without having to spend any spell slots. That seems more trickster to me. Happiness is finding the right comparison group: look more at the rogue and the bard (and the monk? I forget if they were fighters or tricksters) and less at the wizard and sorcerer and you will be happier with your warlock.