Sonic Jr. (just called Jr.) is Sonic and Amy's 10-year-old son. Like his father, Jr defends Mobius from villains like Dr. Robotnik Eggman. His personality also is like his dad's. Plus he can run just as fast as him too. As a baby he always liked to play with his mother's police hat and handcuffs and sometimes even cuffed his own parents with them. Jr however has outgrown that.
Sonic Jr.

His first appearance is "Amy and Sonic's Life Together".