Nyoijizai is a Japanese specter included in a specter art collection book entitled "Hyakki Tsurezure Bukuro" by Sekien TORIYAMA and is a kind of the Tsukumo-gami (a specter changed from a utensil).
如意自在（にょいじざい）は、鳥山石燕による妖怪画集『百器徒然袋』にある日本の妖怪で、付喪神（器物が変化した妖怪）の一種。