is depicted as a mysterious, sharp-witted, and brooding antihero. While his ultimate goal is to protect the world from danger, he dislikes humanity, and once he has set a goal, he does whatever it takes to accomplish it. This often causes him to take risks without thinking them through and puts him at odds with series protagonist Sonic the Hedgehog. Although a loner, Shadow collaborates with treasure hunter Rouge the Bat and robot E-123 Omega in games such as Sonic Heroes, Sonic the Hedgehog (2006), and Sonic Forces. Shadow allies with Sonic in some games, but also does so with Doctor Eggman in Sonic Adventure 2 and Shadow the Hedgehog. Shadow shares many similarities with Sonic. Visually, GameSpot Ben Stahl described Shadow as "an evil version of Sonic himself—similar in appearance, but with darker skin, more angled eyes, and a fearsome snarl instead of Sonic's trademark grin." GamesRadar+ Justin Leeper said that if Sonic was Superman, then Shadow would be his Batman. The characters control similarly in games, as both share skills and the ability to run at great speeds. Shadow has unique attributes in some games, such as his uses of firearms and vehicles in Shadow the Hedgehog and Sonic the Hedgehog, respectively. He can also use the Chaos Emeralds to perform "Chaos Control"—allowing him to distort time—and create weapons like spears. Like Sonic, Shadow can transform into a "Super" form giving him special powers. Development Shadow was created by Takashi Iizuka and Shiro Maekawa, who respectively served as director and writer of Sonic Adventure 2. According to Iizuka, the idea for Shadow originated during development of the original Sonic Adventure (1998), when Sonic Team intended to introduce a rival for Sonic in a potential sequel. Although they rarely discussed the idea, the staff continually thought about it. Eventually, while work on Sonic Adventure 2 progressed, Sonic Team found use in Shadow when they laid out the game's "good vs. evil" plotlines. Shadow's name at the beginning of development was "Terios" ("reflection of"), referencing his role as Sonic's doppelganger. Sonic Team tasked Maekawa with developing Shadow, whom they wanted to look just as "cool" as Sonic. Maekawa settled on the design of a black hedgehog, but struggled coming up with his personality. One night, while he brainstormed lines for a scene in which Sonic confronts Shadow for impersonating him, Maekawa came up with Shadow's first line: "Hmph, aren't you