The Tragic Rose: He's attractive in a dark way, and has many associations with roses, but his home life is brutally abusive.
What Do You Mean, It's Not Symbolic?: Appearance-wise, according to Word of God, Alistair was heavily inspired by the human form of the Green Dragon in alchemic symbolism. His rose motif was inspired by the Lady of Roses in the same symbolism. It's worth noting that both are attractive yet dangerous figures, fitting Alistair's status as embodying the Tower Arcana.
Glass Cannon: Can most likely deal out the most unboosted Physical damage out of the entire cast, but her Defense is worse then the mage's. Well, unless you trigger her Berserk Button, then she becomes a Lightning Bruiser