I was curious about how my suggestion to Fabricio might work, so I tried a Champions conversion or two from fourth edition, I think. (Whatever Classic Enemies was.)
might not be a fair test, because right off the bat, I chose a
character with a power that's not easily represented in ICONS.
However, if you're willing to accept the more wargaming side of gaming,
then Champions characters fit right in. I have Obsidian kicking around
here, and I'll do a sample fight of Leech against him. With luck, I'll remember to post it.