Au where Wash is the constantly exasperated manager of an opera house and Sarge is the troublesome phantom who lives in the basement

Plot ideas:

Thor universe phantom of the opera!!

Loki is the outcast scared with a half jotun form online showing on one side of his face. Seen as a monster he becomes the phantom of the opera house. Feared and respected in his dominion over what is beautiful in his plays.

Thor is a young and ambitious play producer, who takes a shining to your muse. They fall in love but Loki also has fallen for the beautiful angel singer. Loki attempts to steal the muse away, and Thor is forced to protect them at all costs which eventually leads to many battles, and the eventual death of the phantom.