Some Heresy & Black Scorpion stuff would work as basis for supers as well.
The dynamic pose of this guy
or super dynamic Boris
would work well, Scumbore
would make a good huge brawler type.
For a slightly less human look Black Scorpion's Aliens
would be good or Echo
for a bit of a dark/ mysterious character. Even some minis from the tombstone & pirates ranges would make interesting supers (e.g. the sheriff, the still to be released Morgan Earp
or Black Jack Davey
Sorry for bombarding you with suggestions.
- should this little guy be released, a couple of them would be good as henchmen for somesort of voodoo villain.