The owner and executive of the record company Starlight Music, which she inherited from her father along with the Starlight Foundation, a home for foster girls. By touching her Jemstar earrings and saying the words "Showtime, Synergy", Jerrica projects a hologram over her body and becomes Jem, the singer of the band the Holograms. To turn back to Jerrica again she touches her earrings and says "Show's over, Synergy". Only the members of the Holograms, know that Jem and Jerrica is the same person.

Jerrica's younger sister, and the youngest member of the Holograms. Tends to be a bit immature at times and always has guys falling for her, sometimes more than one at the time. She is the keyboard player and songwriter of the Holograms, but can also play many other instruments.

The first girl to be adopted by Jerrica and Kimber's parents as a foster girl to live in Starlight House. By growing up togheter Aja has become Jerrica's best friend. She plays guitar in the Holograms, and is usually the one who drives the car when the girls are off to somewhere. She is the most sporty one of the girls, and makes sure the other girls stay in shape. She knows a little chinese and karate, which she learned while she was very young and still lived in China.

The second foster girl to move into Starlight House. She played the drums for a while, and later decided to switch to guitar. She also dreams of working as a fashion designer, and often designs clothes for the Holograms and Starlight Girls, which is probably why they are all always so well dressed.

The new member of the Holograms, who took over on drums after Shana after winning a drum duel in the talent search. She has played drums since she was very young, and is also good with other percussion instruments. Raya is a bit shy but can have a temper aswell. She is the only girl among three brothers. Her family is mexican and owns and operates their own greenhouse.

A holographic computer built by Emmett Benton, Jerrica and Kimbers father. Jerrica's Jemstar earrings are small remote projectors which enables Synergy to communicate, project holograms, and even voice imitations through, which makes it possible for Jerrica to become Jem without Synergy's computer form being presence. Synergy is kept in Starlight Mansion, in a hidden room behind a holographic wall. But Synergy can also go out from the computer, in the form of a hologram.

A technical engineer and the roadmanager of Jem and the Holograms. He first met Jerrica through her father, and is now her boyfriend. While he has also found interest in Jem, he has no idea that Jem and Jerrica is the same person. As Jerrica struggles to find a way to reveal her secret identity, Rio has made it clear that he hates deception and liars.

She is the lead singer of The Misfits, and also plays guitar. She has a rich father and has always gotten anything she pointed at. Although her attitude and temper makes her come across as spoiled, few people know she was abandoned by her mother when she was very little. While her real name is Phyllis Gabor, no one is allowed to call her that.

She plays guitar in the Misfits, and is probably the cruelest of the Misfits, who takes things a step further. She has been poor most of her life, and never learned to read. She ran away from her home in Philadelphia when she was 13 years old, and took a number of minor jobs as waitressing, before joining the Misfits.

The youngest member of the Misfits, and the one with the biggest heart. Her nickname was chosen for her by Pizzazz. She plays keyboard and guitar, and writes the music of the Misfits.

Comes from a lower class family in England, being a pathological liar, she claims her family is aristocrats and that she is close friends of the royalties of England and several celebrities. She first played with the group the Tinkerbillies, who came to the USA but were so obnoxious that they got kicked out of the country by the immigration department. She later met the Misfits while performing at a club in the USA, while the Misfits were looking for a new member. Although Roxy never approved of her. Pizzazz used her father's money and influence to get a resident card for Jetta. She now plays saxophone in the Misfits.

He used to work for Jerrica's father, and inherited half the music company Starlight Music when Jerrica's father died. He has also been the owner of Misfit Music, but now owns half of Stingers Sound. He is sly businessman, but has had a hard time promoting the Misfits ever since Jem and the Holograms showed up.

The biggest fan of the Misfits, but not allowed to join the Misfits as a band. She is always hangs out with the Misfits though, who takes advantage of her and her abilities of disguising herself to spy on Jem and the Holograms. She doesn't play any instruments but manage get attention by causing noise with the two cymbals she wears as armrings.