Daisy, Daisy Adair.
Daisy is dead.
No, really, she has been for some, oh, 70 odd years. She died in a fire on the set of Gone With the Wind. Then she became undead and a reaper.
What's a reaper? Well, she doesn't carry a scythe or wear a long black robe (unless it's fashionably cut and probably made of silk). Per Dead Like Me, a reaper is any old regular undead shmo with the ability to yank someone's soul out of their body.
Generally, this only happens just before someone dies, and is done to make sure they don't feel any pain before death and can make an easy transition to whateverthehell comes next.
But it can be done at any time.
There's this policy in game that characters don't die. So Daisy will get more and more frustrated as she continues to not reap people and try to figure out why whatever it is that tells her where to go has sent her to Fandom. That doesn't mean she'll be averse (other character willing) to yank a person's soul out and knock some sense into it if they piss her off.
Daisy heals ridiculously quickly (in canon we see a stab wound to her hand heal over in seconds), but will generally avoid any situation where she might get hurt. On the surface, she seems to be pretty vapid and self-obsessed, with an oh-so-too-cool-for-you classic Hollywood attitude to match her high fashion outfits. This is merely a cynical exterior she presents to mask the fact that she's actually deeply insecure, and desires only to be loved.
Yeah, I know, poor baby.
The simple fact is that while Daisy may not appear to care, and will often think that the drama of day to day life in Fandom is beneath her, she cares very deeply about other people, and doesn't want them to get hurt.
Lastly, Daisy is not afraid to talk about sex. At all. She's done some pretty raunchy things with some pretty famous people, and only the fact that only the Doctor knows the real truth about her keeps her from bragging it all over the place. She can and will use her body to get her way with absolutely no qualms whatsoever.
That's about it for Daisy.