LadyRae
SPOILER ALERT-- MINOR (VERY MINOR SPOILER)
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I think that if you are the PC, any class can have a familiar. There is a scroll of Find Familiar somewhere early on in the game (maybe Irenicus' first dungeon)and I'm not 100% positive but I do think anyone (pc) can read it and cast.
Cloudy
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Storm-Queen
StormCloud of the Black Knight