Besides being a thief, Otto van Cooper was a great fighter ace, and mechanic.
― Sly Cooper[src]
Otto van Cooper was an ancestor of Sly Cooper who was a genius mechanic and skilled fighter pilot. Due to his physical ineptitude, he used his talents to pull off heists, with his machines facilitating his thievery. He kept some of his technical blueprints in the Thievius Raccoonus. The propeller blades of his biplane were shaped like the trademark Cooper hook. His section of the Thievius Raccoonus was stolen by the Fiendish Five's demolitions expert, the Panda King.
In addition to his thieving reputation, the commentary Sly Cooper makes in the Cooper Vault near the end of Sly 3 mentions that he was a fighter ace. His trademark plane can be seen hanging up in the Cooper Vault. Otto's section of the vault showcases his mechanic skills as he rigged propellers to test the intruders reaction time, something that Otto was known for, being a fighter pilot.
In Sly Cooper and the Thievius Raccoonus, after Sly defeated the Panda King, he reclaimed Otto van Cooper's section of the Thievius Raccoonus. He utilized Otto's designs to make two modifications to the Cooper Van: a battering ram in the front, and a turret that replaced the satellite at the top of the van.
The turret was used to clear the route to Clockwerk's fortress of mines and to destroy all of the Robo-Falcons that swarmed the van. The gun was later destroyed because of a low ceiling which the gun smashed into. The battering ram was used to defeat Fire Slugs that were attempting to disintegrate computers that were falling from the ceiling in the next area, computers that Bentley needed in order to open the passage leading further into the fortress. Without Otto van Cooper's designs, Sly may never have been able to defeat Clockwerk.
In Sly 3: Honor Among Thieves, the Cooper Gang built a biplane, which was based on Otto's. Sly used the biplane in the ACES competition, and at Kaine Island to destroy several missile turrets and defeat robotic bats and Dr. M's giant Whale-Fly.
- Otto's plane is shown to be a triplane in Sly Cooper and the Thievius Raccoonus; however, in Sly 3 it is a biplane.
- He was likely named after Otto Lilienthal, the first person to make well-documented, repeated, successful gliding flights.
- Otto was presumably Dutch, because his full name is "Otto van Cooper," and "van" is a Dutch preposition.
- Otto is the only Cooper that does not have a handheld cane stored in the vault, so it's unknown what his cane looked like. However, he had to have owned one as he needed something to get in the vault with.
- Sly Cooper and the Thievius Raccoonus
- "Fire in the Sky" (cutscene)
- Fully restored Thievius Raccoonus cutscene
- Sly 2: Band of Thieves
- A Shadow from the Past (cutscene)
- Sly 3: Honor Among Thieves
- Sly Cooper: Thieves in Time
- Prologue (cutscene)