Baradagi, formally named Ryūko Harataki, serves as a covert antagonist. Acting under Chilthonian, leader of the Telephone Pole Gang, Baradagi infiltrates Imazuru High School by operating undercover as a student. This false identity enables espionage crucial to the gang's objective of global conquest, initially targeting an unspecified Kyūshū prefecture.

Physically, Baradagi sports distinctive pink hair and masquerades as an ordinary student while secretly coordinating hostile operations. The character commands subordinate minions within the gang's hierarchy, directly executing destabilization efforts against societal structures.

During operations, Baradagi adopts the military-style alias "Colonel Baradagi," reflecting the operational authority and tactical responsibilities held while carrying out Chilthonian's directives.