When Rook first met Ben in The More Things Change: Part 1, he was respectful of Ben, and in The Frogs of War Part 2, Kevin exasperatingly points out that he's "so polite." Unlike Ben, Rook is more stoic and prefers to think before acting. He used to treat Ben more like a superior instead of a friend/partner as he usually addressed him as 'sir.' He now 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. While he is very intelligent, his lack of experience can make him somewhat naive and often the rear of Ben's jokes. He seems to dislike chili fries. Nowadays, he sees Ben as a friend. Rook still has difficulty understanding his Earthly expressions, and he says that he still can hardly deal with 16-year old Ben.
Rook is shown to be formal, such as initially calling Ben "sir" or referring to Gwen as "Miss Tennyson." When Rook first met Ben in The More Things Change: Part 1, he was respectful of him, and in The Frogs of War Part 2, Kevin exasperatingly points out that he's "so polite."
Rook using the Proto-Tool as a bowRook uses various Plumber weapons and technology, such as the Proto-Tool to help him in battle. He is adapted to using the Proto-Tool as a sword, bow, grappling hook, blaster, and various other things. It has also been shown to be very nimble and has impressive acrobatic skills. He also wears very durable body armor called Proto-Tech Armor.
Rook is also a master in terms of strategy and battle tactics.
Rook is highly skilled in combat, combining the use of his Proto-Tool with hand-to-hand combat to disarm opponents. Through the use of hand-to-hand combat, Rook was able to fight with Ester, as well as take on and defeat multiple enemies at once even when weakened.
Rook cannot handle high temperatures for long periods of time due to having fur as shown in Hot Stretch.