|Gender||Male and Female (5th anime)|
|Eye color|| Black (3rd and 4th)
Unknown (green) Orange (orange)
|Hair color|| None (3rd and 4th anime)
Brown (5th anime)
|Height||Shorter than Kitarō|
|Abilities||Disguising as humans|
The zashiki-warashi have been seen many times in the anime.
Zashiki-warashi (座敷童/座敷童子, Zashiki-Child zashiki-warashi?), sometimes also called zashiki-bokko (座敷ぼっこ, zashiki-bokko?), is a Japanese yōkai, stemming from Iwate Prefecture. The legend of the Zashiki-warashi is similar to the legend of the Russian domovoi.
The name breaks down to zashiki, a tatami floored room, and warashi, an archaic regional term for a child. The appearance of this spirit is that of a 5 or 6 year child with bobbed hair and a red face. Zashiki-warashi can be found in well-maintained and preferably large old houses. It is said that once a zashiki-warashi inhabits a house, it brings the residence great fortune; on the other hand, should a zashiki-warashi depart, the domain soon falls into a steep decline.
To attract and maintain a zashiki-warashi in the home, it is said the spirit must be noticed, appreciated and cared for properly, much in the manner one would raise a child, though too much attention may drive it off. As the zashiki-warashi is child-like in nature, it is prone to playing harmless pranks and occasionally causing mischief. They might for instance sit on a guest's futon, turn people's pillows over or cause sounds similar to kagura music to be heard from rooms no one uses. Sometimes they leave little footsteps in ashes. There are different variations as to who can see the zashiki-warashi; usually this is limited to inhabitants of the house, sometimes to children.
The Ryokufūsō in Kindaichi-Onsen, which burned down on October 4, 2009, was famed for its zashiki-warashi. Yōkai similar to zashiki-warashi in other parts of Japan include the makuragaeshi in Ishikawa Prefecture, the akashaguma or kurabokko in Tokushima Prefecture and the akashaguma living in the Kotohira Shrine.
- In the 5th anime, there are two zashiki-warashi that are chosen for the 47 spirit warriors. They're the representative(s) of Iwate. They're also the 12th of the chosen 47 Yōkai Warriors of Japan. Their marks are located on the left (green one) and right (orange one) arm when they're knotting their arms.