Which of the following is not a Nintendo® game character?

Sonic the Hedgehog™ is not a Nintendo® game character. Sonic the Hedgehog™ is a Sega game character. Sonic the Hedgehog™ is a video game franchise that specifically centers on a series of speed-based platform games. The protagonist of the series is an anthropomorphic blue hedgehog named Sonic, whose peaceful life is often interrupted by the series' main antagonist, Doctor Eggman.

Typically, Sonic—usually along with some of his friends, such as Tails, Amy, and Knuckles—must stop Doctor Eggman and foil any plans that he may have of world domination.

The first game in the series, released in 1991, was conceived by Sega's Sonic Team division after Sega requested a mascot character. The title was a success and spawned sequels, and transformed Sega into a leading video game company during the 16-bit era in the early to mid-1990s.