Nimbis are the cloud-like citizens of The Overthere in The Flip Flop Show. They speak in Early Modern English and look mostly identical to each other, save for a difference between male and female (the females have hairstyles.) Among them are four sages: Blubi, Yebbi, Rebbi, and Whibbi. Each one has a unique mustache, and the colors of their robes correspond to their names (e.g Blubi-blue, Rebbi-red, etc.)

Many Nimbis' names resemble days, seasons, or months.