The phrase "dark angels" typically refers to individuals who seem angelic or good on the outside, but have underlying destructive or evil intentions. Full definition
He was cast down along with other dark angels because they complained that god gave man free will, something they did nt have. (religion.blogs.cnn.com)
(This is where a pair of dark angel wings pops out and swoop him around, as the player keeps control of him.) (cbr.com)
She is equally compelling as the innocent maiden of the opening scenes, the seductress in the castle, and the avenging dark angel of her wronged mother. (seanax.com)