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They tend to be characterised not by not taking part in "action," but by being preposterously good at it.
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If that is not Luthien, I donīt know who is

Her action was putting Morgoth to sleep and in that she was very good.
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but a character the author has become excessively fond of and consequently makes too omnicompetent and perfect
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Well Tolkiens wife was an inspiration for Luthien, so I would say that Tolkien was very fond of her and very perfect Luthien was also.