Biblical: Gaghiel is the guardian of the sixth layer of heaven. He is also the Angel of fish. More information on this angel was hard to find--anyone who can provide me solid information, I'll post it here and give you the credit, as long as you give me a source.
Evangelion: Gaghiel appears when Misato and Shinji visit the aircraft carriers transporting the Production Model Unit 02 to Japan. It begins to trash the ships in its wake, and Shinji and Asuka make a run for Eva-02. They dual-pilot it, and somehow it works... though they fall into the ocean with the angel, uneqipped with armor that would make them mobile underwater. Gaghiel puts its teeth through Unit 02, and begins to swim off with it like a fish hooked on a line. Gaghiel too, was hooked, because Unit 02 was still connected to its power cable. Asuka devised a plan that involved pulling the fish-like Angel back in by rewinding the cable, while sending the two remaining battleships underwater and into Gaghiel's mouth. At the last moment, Asuka and Shinji manage to pry Gaghiel's mouth open, the battleships shove in, and unleash all their arms on its internal S2 Organ. It blows up like a bad dish overheated in a microwave. It's one of the less deeply influenced Angels in the series.