A fair-skinned Yo-kai with a large grinning mouth full of dark gray teeth. She wears light pink lipstick and has slightly pointed ears. Her hair covers most of the upper portion of the face and is a light raspberry color. She wears a black and pale pink dress with sheer tights and pale yellow heels to match her cellphone. She also resembles fellow Yo-kai Chatalie.
Nagatha is harsh and critical and does not suffer fools lightly nor gladly. She tends to act more superior, nitpicking at small details.
Anyone possessed by Nagatha will become rather surly and nag the living daylights out of other people for any infractions they see.
Nagatha can be found in the grass at the Excellent Tower.
Freed from Crank-a-kai: "Hmph. Took you long enough to get me out. This means we're friends."
Receiving food (favourite): "Oh, that's good."
Receiving food (normal): "Just average."
Receiving food (disliked):
"Otsubone-sama" is the term otsubone with the -sama honorific. Said term used to mean "lady-in-waiting", but in modern times it refers to unmarried office ladies. "Nagatha" is a portmanteau of the word nag or nagging, and the female name Agatha.
In German, "Nörgelika" has the word Nörgel means "nagging".
Nagatha is likely based on the ohaguro-bettari, a female youkai similar to the nopperabou (see Faysoff#Origin) that has no facial features save for a mouth full of teeth blackened by ohaguro (ancient custom of dyeing one's teeth to protect them from decay and for aesthetic purposes).