Blaze the Cat is an anthropomorphic cat from the Sonic the Hedgehog series, serving as the imperial princess of the Sol Empire and the dedicated guardian of the Sol Emeralds in an alternate dimension. She is renowned for her calm, elegant demeanor, her proficiency in pyrokinesis, and her journey from a lonely, self-reliant guardian to a cherished friend of Sonic and his allies.

Eggman is an obese human with a small, bald head. He has a distinct pinkish nose and a bushy, mahogany mustache. His eyes, which are very rarely seen, are colored blue. Eggman's height is 185 centimeters (6 ft 1 in) and he weighs 128 kilograms (282 lb). Described as the vilest person alive and has an iq of 300.Eggman continually devises plots to achieve world domination, which range from using Animals to power his robots—known as Badniks—to constructing massive war machines, harnessing ancient powers, and manipulating spacetime itself. Despite his genius, his plans are always foiled by Sonic the Hedgehog and his friends. Nevertheless, Eggman remains undeterred, always managing to escape capture and continuing his quest for conquest. His narcissism and immature behavior often lead to his downfall, but his unrelenting pursuit of power makes him one of the most dangerous threats in the universe.