Bentley is one of Sly Cooper's two allies. He is the deuteragonist of the Sly Cooper series and the "brains" of the Cooper Gang as he is incredibly intelligent, he serves as the chief planner, demolitions expert, and the computer hacker of the gang while also devising plans and assisting the gang through them.
He is a male anthropomorphic turtle with green skin and black eyes which are covered by glasses, which he needs due to being nearsighted.
Bentley first appeared in Sly Cooper and the Thievius Raccoonus at the age of 18. Although his current age is unknown, He was 20 in Sly 2: Band of Thieves and 21 in Sly 3: Honor Among Thieves.
At the end of Sly 2, Bentley lost the use of his legs and currently uses a highly-modified wheelchair that actually makes him more mobile and powerful than he was while able to walk.