Freyja Christiansen otherwise known as The Mortician is the daughter and accidental murderess of Nerthus Christiansen and Njord Christiansen. Her powers originate from an unknown source but she hypothesizes that they came from her late great-grandmother on her mothers side.
As said before the origin of her powers are unbeknownst to her but as far as she is aware she is cursed with the ability to kill someone by making eye-contact and she can see/speak with spirits. The obvious downside to these powers is not only that she accidentally kills people all the time(not that she cares) but also that it drains her energy and causes a major migraine.
Freyja didn't really choose to do anything with her powers she just accidentally murdered her parents so the media assumed her position as a "villain" and bestowed upon her the name "Mortician". She doesn't actually have any enemies other than the police who are hell-bent on putting her in prison.