While formulating this ask, I was wondering if Moira would be a Thief of Life or a Sylph of Life, then I remembered the Rogue class. Moira would definitely be a Rogue of Life; stealing life in order to give them for her team-mates

Seems fitting enough, she also fits the Outlaw archetype, working for Blackwatch, conducting morally dubious experiments, and she does it all to further Humanity’s Evolution, which is technically Selfless.