Setting Sonic Underground aside due to it being non-canon, Sonic does not have any royalty in him.
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Yes, in Sonic Underground he has a sister named Sonia. In the show Sonic is a prince and has a brother named Manic.
The anagram of sonic the hedgehog "sonic the hedgehog."
Adventures of Sonic the Hedgehog Sonic The Hedgehog(SatAM) Sonic Underground Sonic the Hedgehog The Movie Sonic X
Sonic the hedgehog is, as his name suggests, a hedgehog.
it's (sonic the hedgehog) and (shadow the hedgehog) and (silver the hedgehog)