Sonic/Fullmetal Alchemist

Cast:

 * Sonic as Edward Elric (Both have a end letters with letter c)
 * Tails as Alphonse Elric
 * Knuckles as Roy Mustang
 * Espio as Frank Archer
 * Vector as Shou Tucker
 * Antoine as Alex Louis Armstrong
 * Silver as Jean Havoc
 * Rotor as Tim Maroch
 * Shadow as Isaac McDougal
 * Uncle Chuck as Van
 * Sally as Winry Rockbell
 * Amy as Izumi Curtis
 * Blaze as Olivia Mira Armstrong
 * Rouge as Riza Hawkeye
 * Dr. Eggman as Scar (Dr. Eggman and Scar are both the Main Villains in the Series)
 * Scratch and Grounder as Greed and King Bradley
 * Professor Gerald Robotnik as Wrath
 * Breezie as Envy
 * Wave as Lust
 * Mephiles the Dark as Father