yes her name is sonia the hedgehog
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Sonic's brother is "Manic" and his sister is "Sonia."
Sonic has a brother (Manic) and a sister (Sonia).
Yes, in Sonic Underground he has a sister named Sonia. In the show Sonic is a prince and has a brother named Manic.
Manic and Sonia are Sonic's brother and sister in Sonic Underground only.
Sonic has one sister named Amy and three brothers named Shaow and Silver. Report if one more edit. Sonic's sister and brother appear in Sonic Underground. His sister's name is Sonia and his brother's name is Manic.