Do you mean simulator Sonic?
A vertex was made of him, but Sonic is limited with what he has, so it only had the antennae.
This way, we can have the antenna, chest piece, and hand pieces.
lol. I tried my best. That was way back in the vertexing days.
Anyways Nanobuds, about that weirdness going on there.
Whenever I get that error (and believe me, I get it a lot with the E-100 robos) it's because one single polygon has multiple textures mapped to it. When imported, BB doesn't know what to do with it, so the entire model gets mapped to one texture.
All you need to do (not that it's simple...) is use the divide by IDs script and split the model up by bitmaps. Then you need to manually drag and drop each texture on to the part that uses it. It's really tedious.
It works, but if you've already rigged the model it will annihilate your skin modifier. You'll need to re-rig the entire thing.