Sonic is the leader of the Sonic Storm Adventure team.
Sonic met Nancy when Sonic was 7 years old and Nancy was 6 years old. Nancy ran away from home after her mother died and it was raining, so Sonic put his umbrella on her so she won't be so cold and they became friends. At the age of 12, Sonic has discovered that Nancy loves him and has the same feelings as well, but won't admit it. Sometimes they always kiss (Sonic's Final Destination 5, Sonic The Hedgehog Meets Felix The Cat, Sonic Unleashed (Cameron Version), Sonic Storm Adventures of The Hunger Games, Sonic Storm Adventures of The Hunger Games: Catching Fire, Sonic Storm Adventures of The Hunger Games: Mockinjay Part 2, Sonic Storm Adventures of Brave, Sonic the Hedgehog and the Nuttiest Nutcracker, and Sonic the Hedgehog and Jak 3 ), but sometimes their friends always interrupt the moment. (Sonic Generations (Dracoknight Version) and Sonic the Hedgehog meets Thor) People say that they are boyfriend and girlfriend, but that didn't happened yet.
He and Lin Chung are very good friends.
Sonic trusts Michael when he trys to save them from demon angels.
Sonic is very good friends with Ella until her death.
He and Julie are really tight.
Sonic and Sora were childhood friends when they were 5 years old, but since Sora disappeared, Sonic forgot all about him.
He and Jak are great friends.
Sonic thinks that he met Mushra when he was 7 years old and when Mushra was 8 years old, but he doesn't know when.
At first he and Terra didn't like each other, but they became friends. Somehow Sonic fell in love with her, which Nancy doesn't like.
Sonic and Annie have been very good pals since the day they met.
Sonic has been kind to Phyliss since they met. He even tries to help her find her older brother.
Sonic has been a really good friend to Vivian.
Sonic has been a really good friend to Frankie.
Sonic saved Libby from a monster and has been a good friend to her.