|Voice Actor||Bumper Robinson|
Rook Blonko is Ben Tennyson's alien partner. He comes from the planet Revonnah and owns a versatile weapon called the Proto-Tool. He excels in combat and has several feline characteristics such as having fur.
Rook is tall, with periwinkle-blue colored fur, black and white markings on his face, and pointed ears. He carries the Proto-Tool on his shoulder and wears blue-and-black Proto-Tech Armor.
- For more information on Rook Blonko, see the article on Ben 10 Planet.