Hank and Barb's energetic son and Max and Phoebe's younger brother. He is Nora and Chloe's older brother. Billy has super-speed and super-strength and is cheerful, innocent, and sometimes clueless. He looks up to his siblings and enjoys using his powers, while trying to balance superhero training with school and family life. Billy is approximately 9 in Season 1, 10 in Season 2, 10-11 in Season 3, and 11-12 in Season 4.By the later timeline, he is approximately 17-18.

Hank Thunderman is the super-strong father of the Thunderman family and a former superhero known as Thunder Man. He is married to Barb, also a superhero, and is the father of Max, Phoebe, Billy, Nora, and Chloe. Hank loves his family but can be overprotective and competitive. In normal life, he works as a realestate agent while secretly balancing family life with his superhero past. Hank remains an adult throughout the original series and continues his life as a father and former superhero into The Thundermans Return and The Thundermans: Undercover.

is the superpowered mother of the Thunderman family and a former superhero known as Electress. She is married to Hank and the mother of Max,Phoebe, Billy, Nora, and Chloe. Barb is loving, intelligent, protective, and often keeps Hank grounded. In her normal life she focuses on raising her children and managing the family, while still embracing her superhero abilities and past. She remains an adult throughout the original series and continues supporting her family as they grow older.

Max's twin sister older by 30 seconds and never lets max forget. She is Billy, Nora, and Chloe's older sister. Phoebe is responsible, intelligent, kind, and determined to become a superher She uses powers such as telekinesis, freezing, and heat breath while balancing school, friendships, family responsibilities, and her rivalry with Max. Phoebe is 14 in Season 1, around 15 in Season 2, 15-16 in Season 3 and 16-17 in Season 4. By The Thundermans Return and The Thundermans: Undercover, she is approximately 22-23. In Undercover, Phoebe becomes co-leader of the T-Force alongside Max and is sent undercover to Secret Shores. Her civilian cover job is working as an art teacher at Secret Shores School, allowing her to investigate the town's threats while keeping an eye on Chloe.

is Hank and Barb's son and Phoebe's twin brother. He is Billy, Nora, and Chloe's older brother. Max has superpowers including telekinesis and often dreams of becoming a supervillain, competing with Phoebe. Despite his mischievous nature, he cares deeply about his family and eventually learns to use his powers for good. Max is 14 in Season 1, around 15 in Season 2, 15-16 in Season 3 and 16-17 in Season 4. By The Thundermans Return and The Thundermans: Undercover, he is approximately 22 23. In Undercover, Max becomes co-leader of the T-Force with Phoebe and serves as the vice principal of Secret Shores School as his civilian cover. He uses his position at the school to help investigate the new threat while helping look after Chloe.

younger sister. She is Chloe's older sister. Nora has heat vision and is confident, sarcastic, competitive, and mischievous. She loves her family but can cause trouble with her strong personality. She spends her life balancing school, family adventures, and growing into her superhero abilities. Nora is approximately 8 in Season 1,9 in Season 2, 9-10 in Season 3, and 10-11 in Season 4. In Undercover she is approximately 16-17

is Hank and Barb's youngest daughter and Max, Phoebe, Billy, and Nora's little sister. She develops teleportation powers and is energetic, curious, and playful. As the youngest Thunderman, Chloe is adored and protected by her family while growing up surrounded by superheroes and learning how to control her powers. Chloe is born during the original series, grows from an infant into a toddler during the later seasons, and is approximately 12-13 during The Thundermans: Undercover. During the Secret Shores mission Phoebe and Max bring Chloe with them so she can experience a more normal life, make friends who don't know she's a superheroand continue developing her abilities

Dr. Colosso is Max Thunderman's pet rabbit and former supervillain, who was transformed into a rabbit by Max's grandfather as punishment for his crimes. He secretly lives with the Thundermans and often gives Max advice about becoming a villain. Despite his grumpy, selfish personality, he becomes part of the family and genuinely cares about Max, occasionally helping him and the rest of the Thundermans. Unlike the human Thundermans Dr. Colosso's age does not follow their timeline and is not clearly established. He remains Max's rabbit companion throughout the family's later adventures. He can talk