- "I may not be one of your kind, but I know what it is like to be Human. I think about my loved ones everyday. Their thought is what helps motivate me in this job."
- ―Rook Blonko
Rook is a tall and lean humanoid alien with orange eyes. He usually wears a blue and black Proto-Tech Armor suit with his Proto-Tool on his shoulder. Rook has blue and white fur with black stripes across his body.
Rook takes a tactical approach to most things, and always thinks before he acts. He also has a formal dialect, calling people that he doesn't know by respectful terms such as "sir" or "ma'am." He is generally open-minded and gets along with most people, although certain beings can push him to his limit.
- Plumber Training- Rook's combat experience comes from training at the Plumber's academy, and has improved his fighting style Revonnah Kai and developed his combat through missions from being a Plumber.
- Mechanical Knowledge- Rook has incredible knowledge and proficiency at repairing various technologies and machinery and understanding how they work.
- Proto-Tool- Rook's Proto-Tool has over a million uses and can be very versatile in certain situations.
- Proto-Tech Armor- Rook wears a protective armor that allows him to withstand considerable damage.
- Extreme Heat- Rook can't withstand being exposed to extreme heat due to having fur.
- Unpredictability- Rook can be at a disadvantage if he faces an unpredictable foe since he is usually accustomed to conventional techniques and fighting styles.
Before 5 Years Later
- At age 19 in And Beyond Episode 5: Krypton and Vegeta, Rook is seen dancing on a beach from the planet Vegeta with a few Saiyans.
- In The Message, Rook was seen after the battle with Psyphon, watching the prisoner while Ben talked to Blukic and Driba.
5 Years Later
- In Chapter 1: Alienated (Page 9 - 56), Rook was teleported into the Null Void with his partner Ben Tennyson to investigate a disturbance in the abandoned Rooters Base, discovering Danny Fenton, who had set off alarms in the base. Assuming he was a Rooter, Rook engaged him in combat. After the Battle in the Null Void, Rook notified Max Tennyson of Danny's introduction.
- In Chapter 2: The Lonely Ghost (Page 2 - 21), Rook discussed with Danny and Ben how to get Danny back to his dimension.
- In Chapter 5: Oversight (Page 10 - 28), Rook came along with the other heroes to Zim's dimension.
- In Chapter 6: Weightless, (Page 13 - 29), Rook alongside Kevin attempted to figure out how to disable Zim's Ship. In Chapter 7: Fold (Page 7 - 37), Rook offers emotional support for Danny and alongside the other Heroes, tries to formulate a plan to stop Eon. He stays behind on the ship to keep Zim incarcerated, while the others travel to the Keshawn Desert for a confrontation with The Alliance.
- In Chapter 9: Time Out (Page 11- 36), Rook and the Plumber Ship, are teleported away from the battle by Eon to Clockwork's tower. Alongside Gwendolyn and Kevin, they enter with the prisoner, Zim to find Professor Paradox and Clockwork waiting inside.
- In Chapter 10: Again, Rook along with Gwendolyn, Kevin, Zim and GIR find out from Paradox and Clockwork that they are all stuck within a time loop. They all work together to formulate a plain to break the loop. They decide together to send GIR through a rift into the Temporal Zone to find Ben and Danny.
5 Years Later
- Chapter 1: Alienated (first appearance)
- Chapter 2: The Lonely Ghost
- Chapter 5: Oversight
- Chapter 6: Weightless
- Chapter 7: Fold
- Chapter 9: Time Out
- Chapter 10: Again
- Rook is the second Ben 10 character to appear in 5 Years Later, the first being Ben Tennyson.