Rouge the Bat is depicted as a professional treasure hunter devoted to the pursuit of jewels. She calls herself the "World's Greatest Thief" and she fearlessly does whatever needed, disregards personal cost, and ignores abstract morality or manners for potential profit. Additionally, she serves as a part time spy for the government's G.U.N. Federation. Her "feminine charm" makes her appear careless, but she is actually scheming and manipulative. She has a secret crush on Knuckles the Echidna that she won't admit, which is influenced by his determination to protect the Master Emerald. She sometimes teams up with Shadow the Hedgehog and E-123 Omega.
Rouge fights using kicks, especially her signature "Screw Kick," and she can fly using her wings. She is voiced by Rumi Ochiai in all Japanese media, and Lani Minella and Caren Manuel in English media. Rouge first appears in Sonic Adventure 2 as the treasure-hunting character of the Dark Story. She seeks to find the shards of the Master Emerald before Knuckles, and eventually teams up with the other characters to save the Earth. She returns in Sonic Heroes, where she accidentally releases Shadow from his stasis and teams up with him and E-123 Omega to find Dr. Eggman. She appears in various levels of Shadow the Hedgehog and helps Shadow accomplish different goals. She acts as Shadow's partner once again in Sonic the Hedgehog, closely following him and acting independently in some levels. She appears in the story of Sonic Rivals, where she is turned into a card, and saved by Shadow. She is playable in the sequel, where she teams up with Knuckles to find the Master Emerald.
Rouge is one of the main characters in Sonic Battle, unlockable in Sonic Riders and Sonic Rivals 2, and is playable (with an optional romantic path) in Sonic Chronicles: The Dark Brotherhood.