Archangel Hashmal

She's one cold stone bitch, but she gets the job done.

Heaven Invasion
Archangel Hashmal played a key role in ending the Abyss Invasion of Heaven.

After Heaven Invasion
Apparently she went on various muscle building exercises somewhere and hasn't came back, which is really bad considering the Abyss is like eating more planets by the day. After all, only Archangels can really kill off Archdemons for good, and even then, they don't die completely. Anyway, if you're reading this Hashmal, get your ass back here.

Forms
Frame Form: This form takes the shape of a Gundam Frame of Mobile Suit Gundam: Iron Blooded Orphans originating from the Anime Universe. After the time limit is up, Frame Form shifts into Lucifer Form.

Lucifer Form: After the Frame Form ends, she shifts into a giant mech based on the mobile armor with the same name. After the transformation is complete, she goes on a crusade into the Abyss that lasts two hundred years or until she has slaughtered two million Abyss spawn.

Trivia

 * Archangel Hashmal might be the the mother of Archdemon Mammon.