Rook Blonco is a new recruit from the Plumbers that joins Team Tennyson fresh out of the academy. He was brought on board due to Gwen leaving for college and Kevin following suit, thus becoming Ben’s partner in crime. At first they got on each other’s nerves, but over time, they became a well knit duo and best friends.

In Revonnahgander years, he’s in his mid Twenties. But in Earth years, he’s only 16-years-old.

Rook’s record-breaking Plumber final scores earned him the honour of testing the new standard suit the Plumbers will use, the Proto-Tech Armour. The armour is flexible and commpletely bullet-proof.

The Proto-Tool is an invention by Rook’s brother, Young One. It can transform itself into a myriad of weapons and tools. Including a gun, bow, grapple-hook, net-gun, fishing rod, sword, staff, and so much more.

Rooks is very proficient in his native martial art, Revonnah Kai. Which he combines with plumber training for more proficiency.

Ben doesn’t meet Rook until he is 16-Years-Old.

Rook was more fond of Ben then he was of Rook. Mainly due to Ben reminding him of his youngest brother back home (who is a huge fan of Ben 10). Over a couple of months, Ben got used to him and considers him a friend.

Rook believed for years that Ben’s aliens were part of a team protecting the galaxy rather than being one person. This was because his planet is less developed than other worlds.

Rook’s “first name” is actually Blonco. Because his people use the second name as the primary rather than the first.

Due training with Ben, Rook can go toe-to-toe with multiple species of different body-types. Effectively using their weaknesses against them.

Rook is more stoic than Earlthings and prefers to think before acting. Using his by-the-books training instead of reckless fighting, complementing Ben’s fighting style with this difference. He is generally polite and formal, seeing the good in everyone and attempting to be friendly at all times, but some people can push him to his limits.