Amy Rose (known as Rosy the Rascal or just Rosy when she was younger) is a main character in the Sonic the Hedgehog series and is the self-proclaimed girlfriend of Sonic (though Sonic did start dating her recently). She first appeared as an 8-year-old in her appearances (Sonic CD, Sonic Drift, Sonic the Fighters, Sonic R, Sonic the Hedgehog Game World) until Sonic Adventure, where her appearance was changed as well as her age--she appeared as a 12-year-old in Sonic Adventure, opposed to being 8 in her earlier appearances. Amy first appeared in a Japanese Sonic manga series based on the games, where she was the girlfriend of Nikki (Sonic in his normal form). Sega then started to use the character and redesigned her for Sonic CD.
Amy made her videogame debut on the Sega Mega Drive on the game Sonic CD. Amy (or then known as Rosy the Rascal) is first lured to Little Planet, the main setting of the game from a card telling her of her encounter with Sonic. Eggman decides it's his chance and kidnaps Amy right in front of Sonic. Sonic moves on to save Amy by defeating his robotic counterpart created by Eggman, Metal Sonic.