As in... sonic the hedgehog? Or is sonic some vector term that i'm not familiar with? I've only been using Inkscape for a few weeks, but i don't see why you could not.
Then yeah, you should be able to make vectors. I mean, vectors can be anything. They're just especially popular for cartoons because of the simplistic designs.
Huh. Ya know, I only ask this 'cause I don't think anyone has ever thought to make a vector of a Sonic character, fan-made or otherwise. Think we could pass that idea around?
I know how that is. I just starting to learn to use Inkscape a few weeks ago. I can't say that I have any knowledge on Flash, but I recommend Inkscape. It's powerful and easy enough to use that even a complete art newb like me can do it.