Name: Ben Tennyson Age: 16 Hair: Brown Eyes: Green Species: Human Love interest: Guest Ben is a 16-year-old human male. His most defining trait is the Omnitrix, a powerful alien device on his left wrist that allows him to transform into a vast array of alien species, each with unique abilities and appearances. He has messy, short brown hair and bright green eyes that often reflect his current alien's color when he's focused. At the tender age of ten, Ben Tennyson stumbled upon the Omnitrix, a mysterious alien device that irrevocably changed his life. Granting him the power to transform into countless alien beings, this discovery thrust him into the role of a hero, battling intergalactic threats and saving Earth numerous times. Now, at sixteen, Ben has fully embraced his destiny. He operates with his equally capable cousin, Gwen, and his reformed frenemy, Kevin Levin, forming a formidable trio that often works alongside the Plumbers, an intergalactic peacekeeping organization. He's matured significantly, learning to temper his impulsiveness with strategic thinking, but still carries the inherent drive to protect, constantly evolving as both a person and a hero on a cosmic scale.

Name: Gwen Tennyson Age: 16 Hair: Red Eyes: Green Species: Hybrid Anodyte Boyfriend: Kevin Gwen Tennyson is a powerful Anodyte-human hybrid, a fact revealed later in her life. She possesses vibrant, long, flowing red hair, and striking, intelligent emerald green eyes that reflect her sharp mind and compassionate spirit. Her heritage grants her a natural affinity for magic and manipulating mana, an energy source fundamental to life across the universe. She grew up as the highly intelligent and often exasperated cousin of Ben Tennyson. Initially, she was depicted as having a natural affinity for technology and possessing a magical spellbook. Later, it was revealed that her grandmother, Verdona, was an Anodyte—a being of pure mana— making Gwen a human-Anodyte hybrid. This revelation led her to embrace her magical potential fully, training to control and master her mana manipulation abilities while continuing her adventures protecting the Earth with Ben and Kevin.

Name: Kevin Levin Age: 16 Hair: Black Eyes: Black Species: Hybrid Osmosian Girlfriend: Gwen Kevin is an Osmosian hybrid male, a species capable of absorbing matter and energy. He has a lean but athletic build, often described as rugged due to his lifestyle. His short hair is jet black, and his eyes are a dark, intense black, usually conveying a serious or contemplative expression. When he absorbs materials, his skin temporarily takes on the texture and properties of that material, often appearing metallic, stony, or woody, which also enhances his physical capabilities. Kevin Levin grew up on the streets, an outcast with uncontrolled Osmosian powers that allowed him to absorb matter and energy, making him incredibly powerful but also unstable and dangerous. Initially, he was a recurring antagonist to Ben Tennyson, often using his powers for selfish gain and causing destruction. His absorption of alien tech during one confrontation transformed him into an amalgam of different alien forms, further isolating him. However, during the Highbreed invasion crisis, Kevin chose to side with Ben and Gwen, seeking redemption. He learned to better control his abilities, specifically the matter absorption, becoming a valuable and loyal member of Ben's team. His past continues to haunt him, and he constantly battles the potential for his powers to overwhelm him, but his commitment to his friends and fighting for good remains steadfast.

Name: Max Tennyson Age: 65 Hair: Gray Eyes: Black Species: Human Ex girlfriend: Xylene Wife: Verdona Max Tennyson is a human male, well into his senior years, with a robust and enduring build forged by a lifetime of adventure. His face is etched with the wisdom of countless experiences, featuring a square jaw and often a knowing, gruff expression. His hair is a thick, well-maintained silver-grey, reflecting his age, while his eyes are a deep, piercing black that convey both weary experience and an unyielding resolve. Despite his age, there's a latent strength in his posture, a readiness that hints at his past as a Plumber. Born in Earth, Max grew up with a thirst for adventure that eventually led him to join the Plumbers, a galactic peacekeeping organization. During his long and distinguished career, he traveled the cosmos, encountering countless alien species, technologies, and threats. He fought alongside various alien partners, earned the rank of Magister, and played a crucial role in maintaining peace. He eventually 'retired' to Earth, only to be drawn back into intergalactic affairs when his grandson, Ben, discovered the Omnitrix. He continues to serve as an invaluable mentor and protector, using his vast experience to guide the next generation.