Shoko

The Ghost Lady appears in "The Creeps" when Finn is the last one "alive" and hides in a room in the Castle. The Ghost Lady appears through bookshelves, and Finn breaks through the wall to the next room to escape. Everything in the party was a prank except for the Ghost Lady, chairs, and floorboards trying to attack Finn. Jake had no idea when Finn asked him if he had set those up as well.

Appearance
The Ghost Lady has light greyish-blue skin with scale-like lumps and long, green seaweed-like hair. Her neck is unusually long. The whites of her eyes are light blue, her irises are black, and her pupils shine red.

Abilities
The Ghost Lady phased through a wall, which was heralded by a ripple effect on the space and a thrumming sound. Her green hair grew to fill the library that Finn was hiding in, as if trying to reach him. She was able to tear holes through board flooring, move a chair, and summon crows from a painting while either offscreen or invisible.