Damiel's companion angel who observes Berlin and later becomes human after saving Raissa.
They share the same angelic mission of observing, assembling, testifying, and preserving reality.
Damiel and Cassiel are described as two angels who watch Berlin together and observe the thoughts of its inhabitants.
Cassiel is connected to Marion through the angels' shared observation of her life, although he does not form a direct physical relationship with her.
As an angel observing Berlin, Cassiel shares the angels' role of watching human lives, including the lonely inhabitants they encounter.
Cassiel directly accompanies and observes Homer's search through Berlin's historical memory.
Cassiel follows Homer as he searches for the demolished Potsdamer Platz and finds only an open field and the graffiti-covered Wall.
Their connection is based on Cassiel's detached witness of her difficult urban existence.
Cassiel participates in the angels' observation of Berlin's inhabitants, among them a young prostitute working beside a busy road.
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