I don't think the voice is Negativatron. Negativatron has an almost "Hulk-speak" aspect to him whereas the boss audio goes highpitched at the end of every line and speaks normally instead of "out of breath" like the negativatron.
no not yet Sohai
and it doesnt sound like the negativitron in LBP 2 : /
I agree it sounds slightly different, but listen to the boss arena audio and then the Negitivitron audio in the link I posted. They don't sound identical but pretty darn close and there's even some of the same dialogue lines. But yeah, just my observations, I definitely could be wrong
I don't think it's Polygon Man because I know that I and millions of others had never heard of him until speculation on this game.
He was only around for a few months and in that time was exclusive to America. So, less important than Kevin Butler...