Because he's fuzzy, innocent, young, and Sonic's kid-sidekick :P He was practically designed to appeal to the cuteness factor.
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Sonic the Hedgehog is better known to both generations so Sonic the Hedgehog is more famous than Cookie Monster
Sonic has been around longer than princess Leia. So sonic would be more famous.
Sonic the Hedgehog!(: for my opinionsonic
Definitely Cinderella. I have never heard of Sonic the Hedgehog.
From Sonic the Hedgehog (1991 game), Sonic the Hedgehog (2006 game), or Sonic the Hedgehog (1992 TV series)? If you are referring to either of the games, his plans for world domination were foiled by Sonic, and he goes off to plot another scheme. If you're referring to the TV show, nobody knows; it was cancelled before the series was resolved. Robotnik Prime is long gone, dead, never coming back, but only in flash backs and stuff like that. He got replaced by a different version of himself, so at the same time he is not dead. So pretty much Robotnik is still around.