So my initial thought with Rey was The Lonely, however that would be more appropriate as her deepest fear, so I was thinking of something else that is also scary for her, but would be fun to play. The Desolation or The Dark call to me for the fact that they're very sith-y and I'd get to use all my sith rey icons I never get to use. She'd also be able to do more in general with that than she would The Lonely.