Here we have the aptly titled "Green Biker Dude" by Blyka, a side-scrolling fan-game starring GBD in his own PC adventure. Set before the events of Mega Man X2, players take on the role of GBD as they hone their wheelie skills for battle:
"Challenge the main "story" mode, blasting enemies for score as you race hard to the finish of the four tracks, ending with a boss battle and the tragic story of Green Biker Dude. Brush up on your racing skills in Time Attack mode, where you leave behind score and enemies and race hard for the best possible time. Submit your highest score and best times to the Global Records to compete with players around the world, or battle and chase with a friend locally in VS mode. "
If you like what you see, you can download the game at Blyka's Door. The GBD devoted will no doubt get a kick out of this.
Thanks for the heads up, Blyka!