Alistair Blacktide is one of the main characters in the Adventure Time comic "Ice King". She is shown to be a protagonist with good intentions but is revealed that she was an antagonist who follows Lord Lazertron the Third, and is a former member of The Dark Moon Esbats, however she ends up betraying her group to help out Ice King, henceforth being a protagonist. She also claims to "traveled through the fort-two layers of the underworld and back to learn the secrets of the very nature of the dark arts."
She is a stereotypical chill girl, she acts like she doesn't care about anything, but it is revealed that she actually cares a lot when she switches to the "good" side. She is shown drinking a blue slush drink so she is not likely a vampire.
Her hair is short, black, and messy, her skin is purple, she has pointed ears, and she has vampire like fangs. She wears a reddish-pinkish striped scarf, a black baggy sweater, a dark purple long skirt, black shoes, and a blue book bag.
Her age is never officially revealed, however, she is a teenager because an angry man yells, "HEY! I told you darn kids to stop hanging out back here!!" to her and her squad.
I'm Alistair Blacktide Iv'e traveled through the fort-two layers of the underworld and back to learn the secrets of the very nature of the dark arts. Pfft, but I don't care. Whatever, old man.
You totally have to care about being cool. You just have to act like you don't care.
Well... uff... turns out I do care about ONE thing----friendship.