Amy Madden / Havoc: A 16-year-old supervillain protagonist with acoustokinesis (sonic blasts, force fields, and screams) who stands up to the head of the League of Villains, forcing her family to go into hiding.

Vic Madden / Kraniac : Amy's father, a genius mad scientist with a childish streak who invents high-tech gadgets and weapons.

Eva Madden / Surge : Amy's mother, who possesses electrical powers (electrokinesis) and handles problems with a tough, no-nonsense attitude.

Jake Madden / Chaos : Amy’s older brother, who possesses superstrength and comically struggles to be a good person with a developing moral code.

Colby Madden / Flashform : Amy’s younger brother, who has the power of shape-shifting / form manipulation

Hartley : Amy's upbeat, good-hearted classmate and next-door neighbor who discovers the family's secret and helps them blend in.

Onyx:The hooded, menacing leader of the League of Villains who hunts the Madden family after Amy defies him.

Starling : A superhero nemesis who tracks and monitors the family.