Magenta with Orange Baby is a fanmade Sing-a-ma-jig Duet. The big one is magenta, has purple hair, the same ears as the pink "Girls Just Wanna Have Fun" Sing-a-ma-jig, circle eyes with eyelashes which are the same color as the eyes of the Hot Pink Sing-a-ma-jig, a yellow nose, a purple mouth, the same hand pose as the red "All Star" Sing-a-ma-jig, and the same feet as the Violet Sing-a-ma-jig. The little one is orange, has the same ears as the little one from the Dark Blue duet, black circle eyes with eyelashes, a pink nose, a blue mouth, the same hands as the little one from the Plum duet, and the same feet as the little one from the Gold duet. They sing "Oh! Susanna".
Here is what their voices sound like.
Big One: Mermaid (Signing on, entering song mode and signing off in the same voice as the big one from the Plum duet)
Little One: Little one from the Dark Blue duet (Singing in the same voice as the Purple Sing-a-ma-jig)
Here's how they sign on, enter song mode and sign off:
Sign On: Both: "Hello!" (Big one first)
Entry of Song Mode: Both: "Song!" (Big one first)
Sign Off: Both: "Bye Bye!" (Big one first)