From Charadex
Officer Jenny is an Irregular Plural name for multiple separate characters, all with the same name. Little is known about the "Jenny" family, except that all members of the family look nearly identical. Few people can tell Officers Jenny apart (for example, Brock and Ashley).
Officer Jenny has appeared in the webcomic Missing Number: Adventures in Glitch City more often (as of issue 30) than the main character David. However, this might not exactly be fair, as each instance of Jenny is generally a separate character.
Appearances of Officer Jenny
