Cheerilee shares her design and name with a Generation 3 Earth pony. She is a unicorn pony in My Little Pony Crystal Princess: The Runaway Rainbow, and her design was combined with Cherry Blossom to create her Core 7 incarnation, which developed into her current appearance. In the Core 7 series, she is the older sister of Scootaloo and her main personality trait is intelligence. In the current Generation 4, Cheerilee has a twin sister named Cherry Blossom but has no indicated familial relationship with Scootaloo.