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Hagar was created primarily to work with Ishmael (who doesn't have a card image yet, but sets himself aside to accomplish something). However, she is useful anytime you have characters set aside. As long as you have a card in your hand with the same brigade, you can return the character up to 50% faster (Assuming you block with Hagar every turn). (Note that characters only return from set aside in preparation phase so this doesn't allow you to get the Feasts back any faster)
I struggled with whether to make Hagar (and Ishmael) a Hero or Evil Character and in the end settled on Evil Character because there's no confirmation in the Bible that she followed God.
I don't know whether she'll fit entirely into the current Genesis Egyptian theme (given that she doesn't band or create Lost Souls) but she draws if Ishmael is in battle (and he can band to her) and I think themes that rely on set aside can benefit from her ability for sure.
In hindsight, I might make her a Hero/EC (like the new King), but I wanted to post another preview card for the set and this is the only one I had (other than the ones Daniel has already posted).
Comments/thoughts/concerns are always welcome. :)