Emperor Devligus Devotindos is the ruler of the Devotindos Empire and the primary antagonist of Rocket Knight Adventures. He seeks to unseal the Pig Star a powerful doomsday device that once came close to destroying Zebulos.
Following the defeat of the invaders in the past, Devligus formed the Devotindos Empire and attacked against the Zebulos Kingdom, seeking to retrieve the key to unseal the Pig Star, a powerful ancient weapon previously used by the invaders.
In order to find the key, Devligus hired the rogue Rocket Knight Axel Gear to kidnap the Princess Sherry to hold her for ransom against the King of Zebulos, not knowing she was the only one who knew the location of the key.
As the Devotindos Army attacks Zebulos, Sparkster set off to save his country and rescue the princess, fighting the imperial troopers and pursuing Devligus and Axel. Devligus eventually obtains the key and sets off to the Pig Star, pursued by Sparkster. In the Pig Star, Devligus battles Sparkster and is revealed to be a robot before being destroyed by the Rocket Knight. Later, after defeating Axel Gear, Sparkster encounters several other Devligus robots on his journey to the Pig Star's core.
Upon Sparkster's arrival in the center of the Pig Star, Devligus reveals he downloaded himself into the Pig Star's core and fights Sparkster for a final time, ultimately being destroyed by the Rocket Knight.