She's not "evil", just robotically emtionless and logical/rational, laughs.
(Riful is very emotional especially with her Dauffy hubby, and she's often jealous/envious or angry too. But in terms of logical/rational actions she partakes in, she's very emotionless, thus the torture, ~"I don't want you to die, I just need you to Awaken, and that can be forced by pain-torture")
She's honorable if you're respectiful+honorable to her. (Clare wasn't, and Isley seemed to have been her lover and betrayed her too... at least she acts and talks about Isley as if she were his EX, hehe)
Unlike Isley... he's ~"far more cruel", according to Riful :D
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Romeo and Juliet = Dauf and Riful = ewww/Awww-teary sniffle sniffle