Yeeey takes the appearance of a cartoony house. His roof top is red, with a brown chimney and a party hat on top. He has sky blue eyes and a beady red nose. He wears a tiny red bow tie and has colorful balloons attached to his back.
When someone is inspirited by this Yo-kai, they will party harder than usual.
Yeeey is rowdy and energetic. He is always up for big parties.
Yeeey first appeared in EP101, when he caused all of Nate's school friends to party at his house. He wanted the yo-kai to leave, but Yeeey refuse to, as he can't leave until his party meter is at maximum. Nate agrees, so he summons a bunch of his yo-kai friends like Dummkap, Dazzabel, Rockabelly, Wiglin, Steppa, Rhyth, Sandmeh, Mimikin, Blazion and Illoo to help out. After getting the party at a hundred percent, Yeeey was happy about the party, though wasn't pleased to see Nate's mother when she saw the mess.
"Yeeey" is a combination of ie (家, "house") and the exclamation yeah! or yay!.