I don't really know much about the trolls as is, but I see absolutely no reason why Terezi can't be the lawyer? Consider the slot yours!
(And, even though it's AU, I remember the episode being AU to the degree where you still recognized the characters. So if typing quirks are important to her character, go for it!)
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(And, even though it's AU, I remember the episode being AU to the degree where you still recognized the characters. So if typing quirks are important to her character, go for it!)