Tattletell resembles an elderly woman, which is shorter than most Yo-Kai in the series, easily fitting in the palm of a human hand. She has long arms, easily wider in length than her body and diminutive legs. She also has an oval-shaped head and her inner mouth and tongue are green-colored with a single bucktooth in the maxilla.
Her eyes are round and her hair is white and kept in a bun, enhancing her elderly appearance. She dresses in a white shirt, a dark purple shawl and a dark red skirt.
She is very mischievous and enjoys making others reveal their secrets without people realizing them, and shown mostly saying "Tell! Tell!" ("Babaan" in the original adaptation) for everything, but does show she can speak normally.
Tattletell's signature inspiriting is forcing her victim to reveal any secret he/she would not say on normal circumstances. Notably, most of these secrets are often embarrassing. She triggers the inspiriting by clinging on to the victim's face, whether it is a human or Yo-kai. The only drawback of this ability is if the victim's secrets are not embarrassing, such as Walkappa's. Tattletell will not feel satisfied; if the possession attempts are constant and with the same result, her stamina will decrease gradually.
She seems to know Hungramps, he later recognized her and even invited Tattletell to drink some tea together during his confrontation by Nate.