If Kif is Smithers, then I guess that makes Zapp Mr. Burns, which sort of makes sense. Mr. Burns is obviously evil, where Zapp is obviously stupid.
And yet, they both always seem to come out ahead (or at least better than average).
It's hard not to wonder how Zapp would have turned out if Phil Hartman had gotten the chance to play him as planned...
Anyway, for Zapp, I use the Earth Man Heroclix and added the skirt and shoulder pads with green stuff.
I don't know anything about Earth Man. I just picked him because his mini looked like a pompous jerk, so it worked great for Zapp.
As a side note: Earth Man is a really bad superhero name.