About a year or two ago I saw someone who'd created most the Signature Heroes, I checked the forum they were posted on, unfortunately I could not find them or the user.
I do know that Demon Flare made a Statesman last year,
I don't know if it will help, but I made most of my characters into micros. Also created a few marvel micros with various others mixed in.
My micro gallery
Story arcs:
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I love micros! I just suck at making them.
What I miss are the MegaMan versions of people's characters that someone was doing... Quake, I think it was. THOSE were awesome.
Of course, I am biased, as I'm a Sprite *****. 
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Gamma Girl used to make some.
I got these 2 from him.
Char Site | My DeviantArt
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Anyone happen to know where I could find some Micro Heroes based on the game? I'm trying to make my own but I'll be honest they are pretty scrappy compared to the stuff I've seen others make.
So far all I've managed to find are Manticore and Ghost Widow. So anyone found or made any of the signature or minions by any chance?