Delaney I love for a character in a story but would not use as a real person's name as i don't think it would age well. Atm i have a bit of a names-beginning-with-D craze for characters in my stories - Delaney...Delilah...Delia...Delphia...Devereaux...Dianna
Prudence i quite like and i love the nn
Prue. I think of a girl with black hair and blue eyes, and she would be friendly, sensible and arty.
Drusilla makes me think of an evil woman in a book i once rread and i'm sorry but for some reason i can't get past that. it is an ok name though.
My fave is
Prue, followed closely by
Delaney. Then
Drusilla.