Nird appears as a Tengu Yo-kai with red feathers and a yellow beak, and yellow eyes with black circles. He has bushy eyebrows that hang over his eyes, giving him a frowning look. He is dressed in a blue haori and white, baggy trousers, and tall one-toothed geta. He sits a squatting position and his face peers out from behind the olive-green book he's reading. A pair of wings stretches out from his back.
Nird is always reading and is said to hate noisy people.
As a Tengu he is capable of blowing powerful winds at his enemies, said to come from the underworld. He can also weaken healing powers.
Befriended: "Maybe we could be friends and read some books together...?"
Receiving food (favourite):
Receiving food (normal):
Receiving food (disliked):
Freed from Crank-a-kai: "Whew! Glad to be out of there. I have to catch up on a lot of reading."
His Japanese name, "Yomi Tengu", translates as "reading tengu" (Japanese: 読み天狗,"reading tengu"). Based on its underworld-themed techniques, it's likely also a pun on Yomi (Japanese: 黄泉,Yomi), the land of the dead in Shintoism.
His English name, "Nird", is a corruption of the word nerd, but also is a portmanteau of nerd and bird.
His Spanish name, "Tengullón", is a combination of tengu and empollón (clever).
Nird is based on a tengu, a highly populated and diverse race of crow-like youkai. More specifically, they resemble the lower caste of tengu, called kotengu (small tengu) but sometimes also karasu-tengu (crow tengu) or konoha-tengu (foliage tengu). Kotengu are bird-like compared to their high-ranked brethren, which are instead humanoid (see Tengu#Trivia), though they wear the same hermit garbs and tall tengu-geta (one-toothed wooden clogs named after them). They're also sometimes less intelligent and dignified, but they still have their species' proverbial arrogance.