The Cube Guru is an NPC that can be found in Windmill World. It consists of a figure sitting cross-legged on a red pillow, their head being a large rectangular prism with a red eye on each vertical face. The pillow is not a part of it and will remain behind if the character is killed or moved.
The Cube Guru.
Madotsuki sitting on its pillow.
Interaction
Interacting with the Cube Guru causes its head to spin horizontally and a sound effect to play. It reacts normally to the Cat and Knife effects.