Clockwerk

Clockwerk (stylized as CLOCKWeЯK) was the main antagonist of Sly Cooper and the Thievius Raccoonus as well as the franchise. He was a ambient robot-like Eurasian eagle-owl that was the leader of the Fiendish Five and nemesis of the Cooper Clan.

He was consumed by jealousy for the Cooper Clan's reputation as thieves and hated them to such a degree that he replaced his mortal body with soulless machinery just to keep up with them through time. He was presumably destroyed by Sly Cooper, though his legacy continues to haunt the Cooper Gang to the present day.

(Description Source: https://slycooper.fandom.com/wiki/Clockwerk ↗️)