Complete the indicated task to unlock the corresponding character in Free mode.

Amy Rose: Complete all Soleana mystery missions with an "S" rank. 

Blaze the Cat: Complete all Soleana mystery missions. 

E-123 Omega: Complete all GUN Commander missions with an "S" rank. 

Knuckles the Echidna: Complete all Town Stage missions with an "S" rank. 

Miles "Tails" Prower: Complete all Town Stage missions. 

Rouge the Bat: Complete all GUN Commander missions.