She's the kind of girl you can build a deep, abiding frienship with...one that you can refer to when you're down, and need someone to help you in your hurt.
In this, we see a warm, pleasent, nurturing nature--an innocent desire to help those who need it, to relieve the suffering of those who don't deserve to suffer. This is a most noble, heroic trait, to be honest--and to be frank, it easily indicates the connection with Julian. They both desire to help those who are hurting--Ezri for the emotional, Julian for the physical. (They make a great team, don't they--it helps make them a great couple. Too bad we didn't see much of this kindred element between them in the show....)
Now...building on "Mirror Ezri", I'd say she strikes me as something of a girl who's sweet and nice at heart, but in the tough, cruel Mirror Universe, she's struggling her best to deny that girl inside her, and make herself into a "tough-as-nails" tomboy. She's desperate not to let anyone think of her as "weak"...so she puts on a bitter, cynical, smart-aleck air which, frankly, smacks of defensiveness.
Our Ezri would have a field day with counseling her.