sonic is one of triplets in underground, his brother is called manic and his sister is called sonya
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Sonic's brother is "Manic" and his sister is "Sonia."
Yes he does its Manic and Sonia but the thing is there not in sonic x there in Sonic Underground and in Sonic X and adventure of Sonic Sonic thinks of Tails Prower as a brother
Sonic has a brother (Manic) and a sister (Sonia).
He doesn't have one.In Sonic Underground he has a younger twin brother Manic.
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.