Big the Cat

Amy Rose (エミー・ローズ, Emī Rōzu?), formerly known as Rosy the rascal, is a video game character who appears in many of the Sonic the Hedgehog series of video games developed by Sega's Sonic Team. Amy Rose was created by Kazuyuki Hoshino (Sonic Team USA Art Director). She is a pink, female, anthropomorphic, humanoid hedgehog who plays the part of Sonic's self-proclaimed girlfriend. She has chased Sonic since her debut in 1993, and has been trying to win his heart in everything from the series' games to animated TV shows and comics. She was the first female character introduced into the Sonic The Hedgehog game universe and is also one of the series most popular characters, coming in fifth place in an official popularity poll.

Like Sonic and other characters in the series, Amy is significantly shorter and lighter than humans her same age. To be precise, she is 12 years old, 90cm (2ft 11in) tall, and her weight is a secret. She was originally described as being 8 years old in Sonic CD, but as of Sonic Adventure and onwards she has grown older (by 4 years). Also, with the addition of Cream the Rabbit, Amy seems to have found herself a sidekick similar to Sonic's own Tails.

Source: Wikipedia