The Rainbow Kingdom citizens have varying personalities, but all of them are happy with their lives. They rarely speak, but when they do, their lines usually consist of small talk, or simply mumbling.
The Rainbow Kingdom citizens vary in appearance, but most of them appear to have spherical shaped heads. Some are colored white while others are multicolored with blue, green, yellow, etc. They also vary in height but most of them are shorter than True and Bartleby.