Dipper Pines - He is a vampire hunter, feeling challenged with any supernatural creatures but he won't hurt if they are good or bad monsters and humans so he is being honest. Dipper is semi-professional vampire hunter and half-monster. He become bestfriend with Bill Cipher.
Mabel Pines - She is a mysterious, darkly beautiful woman so she is really a witch. Mabel was kidnapped by Evil Witch, Giffany when they were kids. She had a hard life growing up and belongs her twin brother, Dipper Pines. They are separated for their missions.
Gravity Falls Alternate Universe - Vampire and Hunter