Meet Mistress Blood Moon :3
 
She is an actor, who is part of a serial drama, know as “Blood Diamond”. She plays the main antagonist, called Blood Moon.  
“Blood Moon is a vampire pony show has been alive for nearly 400 years, shes survived on the blood of ponies who get lost in the giant forest surrounding her castle like home. Many have come to slay her but always fail, she is a master of darkness and can use shadows to travel. The mortal ponies have told stories about her for ages, painting her as the bloodthirsty monster she is. Blood is mysterious, cold, beautiful and always thirsty for blood.”
 
Outside of her TV role though, she is actually a rather friendly mare, who takes great pride in her craft and takes it very seriously, but she is also very approachable :3