Sonic Underground/WMG

Sonya is a boy and Manic is a girl.

 * Let's face it, Sonia's voice is just too manly for her to not be a crossdresser. And Manic's singing voice does not sound like any boy I've heard.
 * Manic's singing voice doesn't sound like any singer I've ever heard.
 * Doesn't help that Sonia is voiced by the same actor as the other two (Jaleel White, he has said that he used his Steve Urkel voice for sonia)

The Oracle set it all up for his own twisted amusement
Aleena wouldn't have abandoned and split up her kids at all if he hadn't just appeared one night and told her that they had to be split up to reunite to form the Council of Four to overthrow Robotnik.