Sonic/King of the Hill

Version 1

 * Sonic as Hank Hill (Sonic and Hank are both the main protagonists)
 * Amy Rose as Peggy Hill (Amy and Peggy are both girlfriends/wives to Sonic and Hank)
 * Tails as Bobby Hill
 * Cosmo as Luanne
 * Knuckles as Bill
 * Shadow as Dale
 * Vector as Boomhauer
 * Dr Eggman as Kahn
 * Rouge as Minh
 * Cream as Connie (Cream and Connie's names both start with "C")
 * Shade as Nancy Gribble
 * Chris as Joseph Gribble
 * Omega as Cotton Hill
 * Lupe as Didi Hill
 * Sonic Jr. as G.H. Hill
 * Tikal as Tilly Hill
 * Ari as John Redcorn
 * Rotor as Lucky
 * The President as Buck Strickland
 * Espio as Enrique
 * Silver as Joe Jack

Version 2

 * Knuckles as Hank Hill
 * Tikal as Peggy Hill
 * Sonic as Bobby Hill
 * Cosmo as Luanne
 * Espio as Dale Gribble
 * Mighty as Bill
 * Vector as Boomhauer
 * Charmy as Kahn
 * Rouge as Minh
 * Amy Rose as Connie
 * Shade as Nancy Gribble
 * Tails as Joseph Gribble
 * Omega as Cotton Hill
 * Lupe as Didi Hill
 * Cream as Kate
 * Ari as John Redcorn
 * Rotor as Lucky
 * The President as Buck Strickland
 * Espio as Enrique
 * Silver as Joe Jack

Version 3

 * Vector as Hank Hill
 * Vanilla as Peggy Hill
 * Sonic as Bobby Hill (Sonic and Bobby are both blue)
 * Cosmo as Luanne
 * Shadow as Dale Gribble
 * Charmy as Bill
 * Espio as Boomhauer
 * Mighty as Kahn
 * Rouge as Minh
 * Amy as Connie
 * Shade as Nancy Gribble
 * Tails as Joseph Gribble (Tails as Joseph are both best friends to Sonic and Bobby)
 * Knuckles as Cotton Hill
 * Tikal as Didi Hill
 * Cream as Kate