Because we've had just about enough of the Nintendo ones. There are other 8-bit heroes that need pumpkin representation. Jonathan writes:
It's not a masterpiece by any means, but I think it turned out pretty well... and I hadn't seen other megaman pumpkins yet. My friend was going to do a quickman pumpkin so he'd have someone to fight against, but that didn't work out :-) Anyway, I hope you like it!
We do! Our condolences over Quickman, though. His passing will leave a gaping chasm in the vegetable-themed Megaman universe.