Biblical: Ramiel is the Angel of true visions, and the Angel of thunder. Considered both a heavenly, and a fallen angel, he is in charge of souls that come up for judgement on the Last Day. He interperets Baruch's vision, and in female form is regarded as the Angel of joy.
Evangelion: Ramiel appears in Tokyo III, a giant blue floating cube. It just hovers for a while until they try to move in on it... with an invisibly fast, pin-point laser, it attacks everything that comes within range of it. It eventually releases a drill from its bottom point into the ground to begin drilling towards Central Dogma, and to Lilith. It dies when a joint operation between Shinji and Rei in Unites 01 and 00, snipe it with a gun that takes the electricity from all of Japan to power. The gigawattage is enough to break through its AT [Absolute Terror] Field and pierce it, causing it to internally combust and fall from the sky.