Quickleaf
Legend
While I really like 5th editions, arcane casters, they aren't perfect to my eyes. One thing is I think the classes are not distinctive enough.
In this version, I am focusing each class on a specific theme.
Wizard - Breadth of spells. Wizards know a lot of spells, and always have the right spell for the job.
Sorceror - Spell power. No one is stronger at casting spells. A spell in a sorceror's hands is just best than any other class.
Warlock - Spell endurance. Warlock's pact gives them a constant flowing source of power. This allows to cast spells more often than any other class.
That's a really interesting break-down of themes. I would "type" them differently, however, as "spell endurance" and "spell power" are a bit...too nebulous...too mechanistic to hang a narrative differentiation on.
For example, what would resonate more for me, personally:
Wizard - Scholars with a spell for every occasion. Wizards know a lot of rote spells which they must prepare in advance, including obscure ones, silly cantrips, and long-winded spell names. The most complicated arcane caster; creativity comes from the player knowing lots of spells and coming up with unusual uses for them, like a swiss-army-knife.
Sorcerer - Magical mutants manipulating raw magic. Channel that energy to create "spells" on the fly, albeit from a far more limited palette, and have the ability to overchannel (albeit at a risk). The least complexity arcane caster; creativity comes from the player using their tightly thematic palette of magic to create interesting effects on the spot.
Warlock - Pact-makers with knowledge of occult secrets. Use of spells without preparation, but smaller selection than wizard, and get eldritch invocations. The grim-dark medium-complexity arcane caster; creativity comes from the interaction of spells & eldritch invocations & possibly making deals with powerful monsters during play.