Warunolin is a muscular, humanoid Yo-kai with a single cycloptic eye with two irises, the outer iris a light blue and the other a bright pink. He wears an orange jumpsui with black accents, brown boots and gloves and a red scarf. On his back is a single katana.
Warunolin has an obnoxious amount of self-worth, and calls himself a "Legendary Hero", to the point of creating a fake Legend Page for himself for a Request. He also draws pictures of himself in Sukiyaki's ending.
Warunorin is the main target of the Request I am the Super Legendary Hero!, where he tasks Nate and friends to befriend 6 female Yo-kai in order to recruit him: Blizzaria, Insomni, Everfore, Mermadonna, Smogmella, and Unkaind. Once done, Warunorin begins talking to them one by one, eventually grating on Nate, Whisper's, and Jibanyan's nerves, and so to vent it, Nate summons all the girls out at once, much to Warunorin's horror. The girls soon realize what's going on and quickly punished Warunorin for his insolence. The battered Warunorin gives Nate his Medal before he disappears from his wounds.