Just as a thought for Firi, if I was making her character in order to base it more in the realms I would have went with a slime lord of Ghaunadar rather than thrall of Juiblex since Juiblex is an aspect of Ghaunadar in the realms. The two classes are also very similar. Not that I'm saying you should change it, it was just more of a thought.
Here's a link about Ghaunadar:
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I'll try to find a link for the slime lord class, but if I can't it's found in the Player's Guide to Faerun page 186.
PS: Boy am I a geek when it comes to realms lore.
PSS: I knew I would find it:
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