Death (mythology)

A pale girl with dark hair attended Bernice Summerfield and Jason Kane's wedding. She was around the age of fourteen, dressed in black clothing, and carried a red rose.

Bernice Summerfield asked if she knew her, and the girl said it was "[her] job to turn off the lights once everybody's gone" and that Bernice will meet her "one day". (PROSE: Happy Endings)

Behind the scenes
While not explicitly named, the girl in Death of the Endless from Neil Gaiman's comic series by DC Comics.