@S121
Seems reasonable.
I was also thinking of another possible character for them to fight... but I can't think of any...
Also I picture this to be an actual song like an Anthem of sorts for Elpizo's small army Sigma put him in charge of.
http://www.youtube.com/watch?v=kGCCTdK0za8&list=PLF1A3EE9688CC000BRemember I plan on having Elpzio be insane, yet thinks he is doing the right thing. Not infected by the Sigma virus, but fooled by Sigma since Elpizo is a person who wishes to feel important (in fact Elpizo in Zero 2 was originally felt awkward for being made the Resistance Leader by Ciel, but as time progressed, he ended up feeling grandiose and self-important. To the point of which he ended up firmly convinced that he was special and that he could only be understood by others who were special.) Sigma fooled Elpizo into thinking that Sigma's cause was for the good of Reploid's and even other characters, and that he needed Elpizo's help. As such he put Elpizo in a pretty high rank (not only to make Elpizo think that he is truly important, and is helping Reploid's and characters but also because he is a pretty decent fighter.)
Elpizo would definitely think he is doing something good, then when he is first defeated he literally goes insane and demands more power from Sigma. Which Sigma does by infecting him with the Sigma Virus. In turn causing Elpizo to go absolutely insane with power (much like what happened in the ending of Mega Man Zero 2.) Thus the real battle against Elpizo would begin.