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No he doesn't crack his knuckles. That's just his character name.
There is no red hedgehog in Sonic the Hedgehog. You either mean Knuckles the echidna, the second player Sonic from Colors and several bootleg games, or a sonic fan character. Shadow is a black hedgehog with red markings, but he's probably not who you saw.
In the Sonic the Hedgehog comics, Sonic's birth name is Maurice Hedgehog. It was revealed in "Sonic the Hedgehog" issue #47.
Sonic do has three brothers; Knuckles,Shadow but the third I dont know he is a grey colour but not silver since hes from the future.
Sonic the Hedgehog got his name from his grandfathers ( Later on his name was changed to "sonic".)
He isn't as fast as Sonic, but he can glide and Sonic cant :3
Sonic the Hedgehog is the name of the official characters and series whereas Sonic Boom the Hedgehog is most likely the name of a fan character.
Sonic the hedgehog is, as his name suggests, a hedgehog.
there's quite a lot but ill name some Dr eggman, shadow, knuckles, hammerhead, rough etc
Knuckles.....
Sonic the Hedgehog.
The name of the fast blue hedgehog is Sonic the Hedgehog.