First season Troi is mostly emotional when she's sensing other beings, much like Spock. Or when she's emotionally compromised by a virus.
She's very direct and calls out the characters a lot on what they're really feeling versus what they're saying. Example: Troi basically tells Yar in front of the away team that she's horny for her kidnapper in "Code of Honor."
Troi was supposed to be the brain of the show. But as Sirtis puts it, the more cleavage Troi got the less brains she had. When she got the full uniform, Troi's brain returned. Suddenly she's an expert on Romulans and their tech, for instance.
"What's a warp core breach?"
Woman didn't even know that it was a cocktail.
I'd almost assume that as a child she always wigged out so much during routine travel and wouldn't get on the ship without screaming for hours and hours, after she found out how likely it was that even shuttles might explode for no reason, that Lwaxana deleted the term "warp core breach" from Deanna's lexicon.