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I think something that would be cool is a character who uses their body as a sort of container for mystical or divine power, drawing on artifacts and a connection to powerful entities to access abilities beyond their ken at the cost of their body and spirit.
I'd also really love a Spontaneous Caster who gets to learn as many spells and have as many spell slots per level as a Wizard, but the trade-off is that all of their spells are like a deck of cards you have to draw from. Like you roll a die and the number that comes up is the spell you have access to that turn. Feats could let you cheat the system a bit, but overall you basically have to come up with creative ways to use the spells you roll. It'd be especially cool if one of the boons to this trade-off is base-class access to metamagic and maybe even extra actions to apply them to your spells, so that you can adapt the spells you roll into whatever situation you happen to be in. I think something like that could be really fun and interesting and give off that sort of fun wild mage feel.