Coughkoff resembles a light brown chestnut with an opened jagged section on the front, revealing a single, light blue eye. Coughkoff is also really prickly.
Coughkoff makes the inspirited person catch a cold by poking its spikes into the person's throat (in the English dub, this was rephrased to sound more general - with the throat not being specified). In the manga he throws germs that are in a basket he carries around.
According to Whisper, Coughkoff gives you a hacking cough that sounds like a cold but is not a real infection. However the Japanese version, Whisper says that Coughkoff gives you a real cold.
Coughkoff debuted in Yo-kai Duchoo when he and Duchoo makes Nate fake being sick by inspiriting him, allowing him to skip school to play his video game to catch up to Bear and Eddie. He gives him his medal afterwards and flies out of the window, but then Nate gets an actual cold.