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.
Unlike Ben, Rook is more stoic and prefers to think before acting. He is willing to do anything to get the job done He tends to see Ben as a lesser or equal being such as saying he always has to save Ben and that, "[Ben] wouldn't even be alive without [Rook's] help." Although, Ben still manages to impress him from time to time. Nowadays, he sees Ben as a friend.
Rook still has difficulty understanding his Earth expressions, and he says that he still can hardly deal with 16-year old Ben.
Rook is shown to be formal.
Generally speaking, Rook is narrow-minded and doesn't get along with everyone, though there are certain individuals that Rook generally like. For example, Gwen.
Powers and Abilities
Rook is highly skilled in combat, combining the use of his Proto-Tool with hand-to-hand combat to disarm opponents.
Rook is a master in terms of strategy and battle tactics. He also provides an amount of common sense to offset Ben's impulsiveness and lack of subtlety.
Rook's encyclopedic knowledge of certain Earth trivia has proven to be useful at times.
Rook can jump several stories high. Rook has also been shown to be very nimble and has impressive acrobatic skills.
Rook can understand intergalactic languages.
Rook can't handle high temperatures for long periods of time, due to having fur.
Rook is a by-the-book assasin/bodyguard and at times can be too cruel. As a result, he can sometimes be at a disadvantage when facing against a powerless foe because he is even willing to kill his enemy to complete his objective.
Due to being relatively new to Earth customs and culture, Rook is sometimes confused with expressions and Ben's unorthodox style of handling certain situations. At times, he takes certain expressions literally.
As shown in Consequences (Earth-61), Rook mostly never trusts anyone, due to this quality, he was willing to kill Ben.
Rook appears in almost every episode of Alienated: A Hero Reborn.