When Rook first met Ben in The More Things Change: Part 1, he was respectful of Ben, mentioning that he heard all about him in the Plumbers Academy among the cadets. 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 addresses 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 "he (Ben) wouldn't even be alive without his (Rook's) help." Although, Ben still manages to occasionally 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. He still says that he can hardly deal with 16-year old Ben.
Rook is shown to be polite and formal, such as initially referring to Ben as "sir" or referring to Gwen as "Miss Tennyson".
Rook is a Revonnahgander with lavender-colored fur, black and white markings on his face, and pointed ears. He carries the Proto-Tool on his shoulder and wears a somewhat blue-colored Proto-Tech Armor.
Powers and AbilitiesEdit
Rook uses various Plumber weapons and technology, such as the Proto-Tool to help him in battle. Rook is adapted to using the Proto-Tool as a sword, bow, grappling hook, blaster, and various other things. It has also been shown that he is 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 and defeat opponents. Through the use of hand-to-hand combat, Rook was able to fight with Ester.
Rook cannot handle high temperatures for long periods of time due to having fur as shown in Hot Stretch.
Ben 10: OmniverseEdit
Rook is a co-op partner in the game who travels in time to help both Bens.
- According to Derrick J. Wyatt:
- Rook possesses some feline attributes, such as having fur.
- Rook's name is based on Cartoon Network's Rick Blanco.
- Rook is a little older than Ben.
- Rook still has feelings for his ex-girlfriend Rayona.
- Rook partly hates chili fries because of the taste.
- Rook likes healthy and nutritious fresh foods like Smoothies.
- Tramm Wigzell, the executive producer of Omniverse, considers Ben to be an "all experience, but no training" type of Plumber while he considers Rook to be an "all training, but no experience" type of Plumber. He mentions that their partnership will be beneficial in covering their weaknesses.
- Rook thought Alien X was something made up by fans of Ben on the extranet. This was the case until So Long, And Thanks For All The Smoothies.
- Rook has a deep grudge against the Vreedle Brothers because they destroyed the Plumbers' Academy and thus, he had to take his final exam in a trailer on an asteroid.
- In Bros In Space, it is said that a lot of female Revonnahganders are infatuated with Rook.
- In Bros In Space, it is revealed that Rook's first name is actually his family name so his real name on Revonnah is Blonko.
- Rook is similar to Starfire on Teen Titans. Both lived on another planet and now inhabit Earth. Also, both of them are not familiar with expressions people from Earth use and forego the use of contractions, Rook because it is against Revonnah's customs and Starfire because she tends to speak formally.
- Some unused designs for Rook were re-used for residents of Undertown. 
- ↑ http://www.formspring.me/DerrickJWyatt/q/335474720155658824
- ↑ http://www.formspring.me/DerrickJWyatt/q/398876096650570512
- ↑ http://www.formspring.me/DerrickJWyatt/q/416041818023549310
- ↑ http://www.formspring.me/DerrickJWyatt/q/407231411418853385
- ↑ http://www.formspring.me/DerrickJWyatt/q/440668044042205875
- ↑ http://blog.cartoonnetwork.com/2013/04/18/ben-10-omniverse-q-a-with-derrick-wyatt/