I was a little hesitant about this poster; it's obviously got some Act II spoilers. But then I think everyone here has played the game that far, so I'd put up her current role, rather than her initial one. Your relationship with Molly starts out a little rough, but she's got a heart of gold under the front of a streetwalker. Eventually she'll win you over.
Molly's an Aries:
Aries people tend to be energetic, forceful and outgoing. They are good at getting things done, although they prefer starting to finishing. Like the energy of the first rush of spring, they move into the world in a headstrong, pioneering way. Aries people are likely to rush into things before reflecting, and may also be impatient or unwilling to sit back and allow events to mature. They have great vitality and a tremendous need to be physically active.
Aries people have a strong will, and are self-centered about pursuing it, so that they may try to dominate other people until they learn to be more subtle about getting their way. They also have an acute need for love and affection. Aries people benefit from self-discipline, so that they can channel their abundant energy more constructively.
Yeah, mostly checked out. She'll certainly try to dominate the player (until she learns how to be more subtle). And she does have an acute need for love and affection, and will surely benefit from some discipline (either self- or externally imposed).
Molly's come a long way from her role in Act I, but she still has a long way to go before the end.