Full name: Benjamin Kirby Tennyson Species: Human Home World: Earth Residence: Ben's House, Bellwood. Plumbers' Academy (formerly) Age: 16 Relatives; Carl Tennyson (father) Sandra Tennyson (mother) Max Tennyson (paternal grandfather) Verdona (paternal grandmother) Frank Tennyson (paternal uncle) Natalie Tennyson (paternal aunt-in-law) Ken Tennyson (paternal cousin) Gwen Tennyson (paternal cousin) Gordon Tennyson (paternal granduncle) Betty Jean Tennyson (paternal grandaunt-in-law) Joel Tennyson (paternal first cousin once removed) Camille Mann (paternal first cousin-in-law once removed) Vera Tennyson (paternal grandaunt) Clyde Fife (paternal second cousin) Ben (paternal great-great-grandfather) Jedediah (paternal great-granduncle) Sunny (paternal cousin) Baby Chills (children as Big Chill) Lucy Mann (paternal second cousin-in-law once removed) Albedo (corrupted genetic copy). Appearance: He has unkempt brown hair, green eyes, fair skin, and he is quite skinny for his age, though he shows a lot of muscle definition due to being athletic. Ben wears a black shirt that has a green stripe in the middle with a white 10 and green stripes on the sides of his shirt. He wears brown cargo pants with pockets at the knees with a brown belt hidden under the shirt and green and white shoes. He wears the Omnitrix on his left wrist. Ben has displayed good leadership skills, as well as the ability to adapt his attitude to a situation, becoming serious when it's called for. He continues to be kind-hearted and willing to lay down his own life for others. Also, Ben doesn't give up and wouldn't let anyone stop him from doing what's right for those in need, especially his family, friends and mentors, or to bring enemies down, even when he once got a broken arm. However, even as a teen, Ben still displays some of his negative childish traits at times, which usually comes to light when Ben gets too caught up with fame much to the annoyance of Gwen and Kevin. Ben also has a violent, aggressive side: when Ben fails to save someone, is worried about the well-being his loved ones, or if people get hurt because of his failure, he becomes angry and lashes out, even at people he cares about. Perhaps the most notable of these instances is when Kevin willingly mutated himself to stop Aggregor, Ben was determined to kill Kevin, even fighting Gwen when she refused to help him

Full name: Rook Blonko Species: Revonnahgander Home World: Revonnah Residence: Plumber Headquarters, Earth's Orbit Age: At least 16 Occupations: Magister-Ranked Plumber Appearance: Rook is tall, with periwinkle-blue colored fur, black markings on his face, and pointed ears. The middle of his face, his chest and his stomach are white. He has black stripes on his shoulders, waist, lower legs, and lower arms. He carries the Proto-Tool on his shoulder and wears very durable blue-and-black Proto-Tech Armor. Personality: Rook is stoic and prefers to think before acting. For example, when the Perk and Murk Gourmands were at odds on how to save Queen Voratia Rumbletum from the Incurseans, Rook sided with the Perks to attack the Incurseans on the ground rather than invade their ship and save her, which he and the Perks considered to be the less risky route. Rook regularly follows Plumber protocol, such as ordering villains to stand down. When Kundo took over Plumber Headquarters, Rook was initially reluctant to ask Fistina for help, citing Plumber regulations which state Plumbers are not allowed to receive gifts of any kind. Rook has a tendency to be honest to the point of being blunt. For example, when interrogated by Starbeard on whether Ben flagrantly disregards regulations and procedure, instead of defending him, Rook stated that Ben had demonstrated ignorance of procedure, as well as a countless host of other topics. Also, on several occasions, Rook has turned down Fistina, once plainly telling her that her advances are unwarranted and unwanted. Rook is quite formal, initially calling Ben "sir" and referring to Gwen as "Ms. Tennyson". Kevin once exasperatingly pointed out that he is "so polite".[19] Rook also does not use contractions, unless he is sufficiently angered. Despite extensively researching Earth, Rook is unfamiliar with Earth culture and expressions, which can make him come across as somewhat naïve and often the rear of Ben's constant jokes. For example, when Kevin once initiated a fist bump, Rook shook his fist instead. Rook sometimes also incorrectly assumes movies accurately reflect Earth cultur