Kimajo is an effect NPC from which the Witch effect can be obtained. It can be found on Witch's Island.
It looks like a tree with red lights shining through holes in the trunk which look like eyes and a hole is right below them which seems to be a mouth whose jaw moves up and down. It is also the same height as Madotsuki. When the stoplight effect is used the red lights will move down as if the tree would look to the ground.