- Michael Vey is the protagonist of the series. He is a teenager with Tourette's syndrome who is constantly bullied by his peers. Michael is a Glow, one of a few people who have electrical-based powers. His abilities allow him to "pulse" with electric energy, shocking people like an electric eel. He starts dating Taylor at the end of the book when he rescues her from the academy.
- Taylor Ridley is Michael's girlfriend and a cheerleader at Meridian High, whom Michael has a crush on. She is also a Glow who was undiscovered by Dr. Hatch. Her abilities allow her to access and scramble electrical signals in the brain, letting her read minds and even "reboot" them, much like with a computer.
- Ostin Liss is Michael's best friend and is considered a genius. He has no powers, but his brilliant mind is what sets him apart. He begins a relationship with McKenna in the second book.
- Dr. Hatch is a scientist who founded the Elgen Academy. He is the antagonist, who manipulates the Glows and exploits their powers for his personal glory and ambition.
- Jack Vranes is one of the bullies at Meridian High who, along with his friends Wade West and Mitchell Manchester, often targets Michael. Jack drives Michael to Pasadena to rescue Mrs. Vey and Taylor from Elgen Academy. He begins a relationship with Abigail in the third book.
- Zeus has the ability to 'throw' lightning, getting his nickname from the ancient Greek god with the same ability. Zeus's real name is Leonard Frank Smith. He is the first Elgen supporter to defect and join the Electroclan. He is the most powerful electric kid after Michael. Elgen abducted him as a little kid, killed his family, and told him that he did it.
- Wade West is one of the bullies at Meridian High. Wade died from being shot and had his funeral in Peru. Wade is a normal human who helped the Electroclan.
- Nichelle is a Glow who is loyal to Dr. Hatch. Her ability allows her to suck away the power and energy from other Glows. The process is comparable to mosquitoes sucking blood from a host. Because of her nasty attitude and unique ability that only affects them, the other Glows at the Elgen Academy dislike her. She enjoys torturing others with her dark power.
- Ian is a Glow who is first introduced in Purgatory with McKenna and Abigail. He is blind, but his ability allows him to see through what he calls electrolocation, which means that he can see through most substances and track anything with electricity, much like how a bat sees with echolocation.
- McKenna is a Glow who is first introduced in Purgatory with Ian and Abigail. She has the ability to create light and heat with any part of her body. She can heat herself to more than 3,000 Kelvin.
- Abigail, also known as Abi, is a Glow who is first introduced in Purgatory with Ian and McKenna. Her ability allows her to suppress pain by stimulating nerve endings through physical contact or conduction through metal. She begins a relationship with Jack in the third book.
- Grace acts as a “human flash drive,” and is able to transfer and store large amounts of electronic data. She left Dr. Hatch's group of electric children to join the Electroclan.
- Tanner is one of the Glows under Dr. Hatch's control. He has the ability to interfere with an aircraft's navigation and electrical systems, shutting them down and making them crash. He has murdered thousands of people under Dr. Hatch's orders.
- Tara is Taylor's identical twin sister who is immovable in her complete loyalty to Dr. Hatch. Like with her sister Taylor, Tara's abilities deal with manipulation of the mind. She can stimulate different parts of the brain to elicit emotions such as fear and happiness.
- Quentin, also known as Q, has the ability to produce a small EMP, or electromagnetic pulse. He is loyal to Dr. Hatch and is shown to be reckless and impulsive, acting without any regard for ordinary human beings.
- Bryan has the ability to generate highly focused electricity that allows him to cut through solid objects, such as metal, by burning through them. He is loyal to Dr. Hatch, and, like Quentin, is proven to be reckless, acting without any regard to ordinary human beings.
- Kylee has the ability to create electromagnetic power, which means she is basically a human magnet. She is loyal to Dr. Hatch and the Elgen.
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