Sonia the Hedgehog is Sonic's sister.
Shadow doesn't even know Sonia, but if he did he might.
No. Sonia is a fictional game character.
Sonia
"Manic the Hedgehog is a green anthropomorphic hedgehog from the Sonic Underground animated series. He is the brother of Sonic the Hedgehog and Sonia the Hedgehog, as well the son of Queen Aleena." So basically, Sonic's brother is Manic the Hedgehog, and Sonia the Hedgehog is Sonic's sister.
knuckles.
yes
egg plant or magenta
yes her name is sonia the hedgehog
He has a brother named Manic the Hedgehog and a sister named Sonia the Hedgehog.
sonia is sonic's sister in sonic underground you will find out about that and manic the hedgehog is sonic's brother
Sonia was Sonic's (and Manic's) sister in Sonic Underground. She did not appear in any games.