The Excite Biker is a good idea for the game. However, I visualize him riding his bike, while fighting.
About Special Moves, here are my ideas:
-Neutral Special: Turbo: Excite Biker charges his bike. When the button is released, he dashes rapidly attacking his enemies on the path. He can stop the attack by pressing the Special Button again, or crashing against a wall.
-Side Special: Break: Excite Bike performs a Wheelie. He attacks his enemies while dashing.
-Up Special: Aerial Wheelie: Excite Biker unleashes a ramp. Then, he dashes to it, and he jumps making a Wheelie in midair. He attacks the enemies while making this technique.
-Down Special: Spinning Donut: Excite Biker performs a donut flip, while kicking his enemies.
-Final Smash: Victory Lap: Excite Biker unleashes a group of Excite Bikers which dash against the enemies, attacking them!
What do you think? Comment, please.