Corrected entry: Sonic reverts back to normal form before falling through the atmosphere. So why didn't he burn up in re-entry?
Corrected entry: Throughout the show, Dr. Robotnik is called "Dr. Eggman", even by himself and his robots. Dr. Eggman is the nickname the Sonic Team uses to mockingly refer to Dr. Robotnik. Dr. Robotnik hates to be called Eggman.
Correction: Robotnik never once said that he hates being called Eggman. In fact, he's even used that name himself.
Correction: It's Sonic. He can run faster than the speed of sound on foot. That would rip the flesh off normal people or animals. His body is very durable, similar to Superman or other superheroes. Reentry wouldn't hurt him severely.
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