The only mention of the Star Sisters, Sweet Bee and Peekablue in season one. While Sweet Bee and Peekablue have established backgrounds in several Princess of Power continuities, the Star Sisters are three of the more obscure characters that were developed as action figures by Mattel but never produced to be sold in the original line, but were finally released as in a Mattycollector three-pack in 2012.
A female version of Loo-Kee (possibly Laa-See can briefly be spotted in the background at the prom after Glimmer says 'Let's rock this ball' and then again just before the first dance.
In the background, several characters were created as cameos for members of the production and writing crews, including the Show Creator Noelle Stevenson herself. Additionally, future characters like Double Trouble and Flutterina can be seen before they were officially introduced.