Nevada is a moderately pretty, independent, strong woman with exceptional powers that she is 'hiding'. She has a take-no-prisoners attitude when it comes to protecting the ones she loves.
Mad is a cocky, crazy powerful "Head of House" who has rippling muscles. He's attracted to Neveda, probably because of all the witty banter and snark she lobs his way.
So this is basically Kate and Curran, take two.
And I don't even care.
ETA: She's also slightly afraid of Mad, which is also pretty reminiscent. Wasn't Kate a little afraid of the Beast Lord at the beginning?