Naruto: Gekitou Ninja Taisen! (series)
Naruto: Gekitou Ninja Taisen! series is a popular series of 3D fighting games for the Nintendo GameCube based on the Naruto anime series. The popularity of the games stems from their faithfulness to the anime series and their hectic multiplayer mode (similar to Super Smash Bros. Melee for its chaotic style). Although none of the games have been released outside Japan they have picked up a large following worldwide, and Naruto: Gekitou Ninja Taisen! 3 holds the title of most imported game ever (I think).