Rabio and Lepus are twin mechanical rabbits hailing from the world of Bunnyland. When their world is threatened by Yohmaoh and the royal family is kidnapped, the king of Bunnyland summons Rabio and Lepus to the rescue.
In Rabio Lepus and Sonic Wings, the pair appear to be sentient flying machines, while in later games, Rabio appears as the aircraft Aka Usagi. Both rabbits are white with colored ears, eyes, tails, and shoes. They both have buck teeth and wear yellow gloves. After receiving certain power-ups, they wear yellow ribbons on their right ears. Rabio's ears, eyes, tail, and shoes are red, while Lepus's are green.
Lepus is the green-eared 2P character in Rabio Lepus. Oddly enough, he is not playable in the remake, Rabio Lepus Special.
Lepus and Rabio are secret playable characters in the SNES version of Sonic Wings, unlockable via the following method: at the character selection screen, hold down the R button on the second controller, and enter the following code on the first controller: Left, Down, Right, X, Y, A, B, Left, Down, Right, Down, X, Y, A, B.
Neither Rabio nor Lepus has dialogue in single or two-player mode. Instead they reveal another code, this one for unlocking a timed dog fight with the bosses of the game: at the character selection screen, hold down the R button on the second controller, and enter the following code on the first controller: A, Left, Y, Right, X, Down, B, Up.
After defeating all levels of the game with Lepus, a sequence plays that shows Mao Mao waking up in bed, her arm around her Lepus plush. Once again, she has dreamed the events of the game, this time with her toy as the star. Lord River-n-White also has a black and white portrait of either Rabio or Lepus in his house during his end sequence.
Although Rabio and Lepus are not playable characters in any later games, they appear in cameos throughout the Sonic Wings series. The Rabio Lepus video game is visible in the mid-point sequence in two-player mode with Mecha-Keaton and Silver.