Tonic The Hedgehog

Tonic the Hedghog is a brown, crazy- haired hedgehog who claims to be Sonic's long-lost brother. Sonic said he didn't remember him, but Tonic said it was because they were born and seperated at a very young age. Then Tonic asked if he could join the freedom fighters, and when Sonic said no, Tonic ran away crying.

But that was a good thing, because the whole plot was set by Doctor Eggman. Tonic was really the shape shifter Metamorphia. But Metamorphia was caught contacting Doctor Eggman by Tails, and she dropped her disguise.