I prefer simple classes that let you model a wide variety of characters. OD&D does this really well with Fighters. Your Fighter can be a knight, or a pirate, or a robin hood, depending on how you outfit and play them. Nice. The new wave of the OSR has provided us with several adaptations that turn the Thief into a Specialist or Expert or Adventurer, which creates a similar effect: you have a class that provides non-combat skills, be it a box-man, architect, diplomat, tracker, whatever. I like it. But spell casters are not so flexible. The spell list contains enough flavor and world-implication that your Magic User is always a D&D Magic User, and your Cleric always tithes to the Church of Gygax. Gustav Doré, Don Quixote, 1863 So. I present a completely flavor-drained spell list. Just straight mechanics. Want a Fire Mage or Shadow Walker or Time Lord or Gadgeteer or whatever? Just pick the mechanics you need and dress them up in lovely fluff. It's a lot easie