Made famous for his punk mohawk (the standard punk colors red or green) and skinny body, Johnny Napalm is one character that rocks! He is featured in nearly all of the Guitar Hero games, and is customizable with outfits which are able to be purchased with money generated by passing songs/setlists in the games.
Many of Johnny's outfits contain the Union Jack symbol, suggesting that he is of Britsh origin.
His name could be a reference to Johnny Rotten (lead singer of the sex pistoles) Johnny Ramone (guitarist of The Ramones) and the band Napalm Death.
In Guitar Hero Aerosmith there is reference to him hanging out and had a relationship with Judy Nails