Hag

Hag makes her appearance in "City of Thieves". When Finn and Jake are in Stock Woods, she appears from a tree and warns them not to go to the City of Thieves. She appears again after Finn steals a chest from a tower to prove that she was right. After that, Jake kicks her away. She claims that anyone who enters the city becomes a thief. She is very good at hiding and camouflage. She has the same color as trees and wooden floors.

She has a similar appearance and similar powers to the Tree Witch. The Hag is also a tree witch.

Quotes
See Hag/Quotes

Trivia

 * According to Adventure Time character designer Phil Rynda, the Hag is a Tree Witch, and another Tree Witch will appear in season two.
 * It is said by Pen at formspring that she has a single sister
 * This sister, known simply as the Tree Witch, appeared in the episode To Cut a Woman's Hair. She demanded that Finn get her princess hair to cover her balding spot or she would suck Jake into her bottom.
 * She, unlike her sister, is not actually evil. She just warns Finn and Jake.