An adaptation the concept albums Epica and it's sequel The Black Halo by Power Metal band Kamelot, which are in turn based of Goethe's adaptation of Faust.
Ariel - Ariel is a curious, determined, and arrogant man. An unparalleled genius and an accomplished scientist and philosopher, he has become disappointed with the inability of these disciplines to answer his deepest questions, and seeks to uncover the universal truth that they have failed to provide. He strongly believes that discovering such transcendent knowledge is the only thing that can make his life worthwhile. He is based on the character Heinrich Faust from Goethe's Faust. (from Wikipedia)
Helena - Helena grew up with Ariel, and loves him deeply. She is the only person that Ariel has ever truly loved. She represents innocence and all that is pure and good. She is based on Gretchen from Goethe's Faust. (From Wikipedia)
Marguerite - A young woman living in the Town (in which Epica ends and The Black Halo begins), Marguerite's voice and appearance are similar to Helena's. Ironically her character was inspired by the appearance of Helen of Troy in Goethe's Faust Part 2 yet she is named for Gretchen from Goethe's Faust. (Gretchen being a nickname for Margaret or Marguerite). The character in Epica and The Black Halo who is actually based on Faust's Gretchen, though, is Helena so their names are more or less swapped from the original Goethe story. (From Wikipedia)
Mephisto is a rebellious angel who was cast out of Heaven. He desperately yearns to reenter Heaven and be reunited with God. He deeply disdains humans, whom he considers inferior beings unworthy of God's love. Mephisto is one of the only characters to retain his name from the original Faust story. (From Wikipedia)
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