It's only been a month since the Jem movie started its casting process, but already the film has lined up and photographed its full set of Holograms--thanks in part to the rich casting pool that is Sharknado. As announced on the official production blog, Jerrica Benton (aka Jem) will be played by Aubrey Peeples, an actress you most likely know as "girl with shark flying at her in that default screenshot from Sharknado." Thus, despite her being cast as the lead in a Jem movie, for her, this will surprisingly mark a downturn in outrageousness.
As for the Holograms, on keyboard/keytar is Stefanie Scott (A.N.T. Farm) as Kimber; on guitar, Hayley Kiyoko's Aja; and on synth drums is Aurora Perrineau's Shana. Here are their in-costume glamour shots: