Before Suzie Costello was eighteen, she had lost all her grandparents as well as her mother.
She swore to herself that she would find a way to cheat death and live forever, something her mother and her grandparents failed at.
Suzie swore war against her abusive father as soon as she was fully grown. She learned about guns while she was at uni. She planned to shoot her father in the head.
Much to Suzie's chagrin, the day she planned to shoot her father was also the day he learned about his assassination attempt.
Working in Torchwood with a boss who only cared whether she showed up to work or not, a former NHS doctor who was drunk and crying over the loss of his fiancee, another quiet co-worker (who was also a technological genius and the only other attentive worker on the job) and someone the boss hired as a fuck toy allowed Suzie to hide her obsessions of immortality from them. She also discovered that, if she used a glove and a knife that fell from the Rift together, she could use the lives of other animals and humans to extend her life, even if she was already dead.
By the time her beloved Resurrection Glove was destroyed, Suzie never learned to cope with her own death.
Now she's sitting in the darkness she despises with no chance of returning to the living. And she is miserable.