To do some special moves do these button combinations.

Naruto
up,up,b Uzumaki Barrage
down,down,b sexy jutsu
up,down,b summoning jutsu (note: sometimes fails)
Sauske
up,up,b Lions Barrage
down,down,b Chidori
up,down,b Sharigan
Rock Lee
up,up,b Forward Lotus
down,down,b drop weights
up,down,b Master Lotus