Lilo & Stitch/The Little Mermaid

Cast

 * Nani as Ariel (Both Nani and Ariel are both the main heroes)
 * David as Prince Eric
 * Lilo as Flounder (I know Lilo was female)
 * Stitch as Scuttle
 * Jumba as Grim
 * Reuben as Sebastian
 * Cobra as King Triton
 * Gantu as Ursula (I know Gantu was male)