Wisteria with Green Lemur is a fanmade Sing-a-ma-jig Duet. The big one is wisteria, has pink hair, the same ears as the Pink Sing-a-ma-jig, purple flower eyes, a pink nose, a mouth that is about the same color as the little one from the Plum duet, the same hand pose as the big one from the Orange duet, and the same feet as the Plum Sing-a-ma-jig. The little one is green (about the same shade of green as the little one from the Gold duet), has lemur style ears, hands and feet, black flower eyes, a pink nose and a blue mouth. They sing "The Farmer in the Dell". but in Japan, they sing "This little light of mine".
Here's how their voices sound.
Big one: Big one from the Red duet
Little one: Lilac Sing-a-ma-jig
Here's how they sign on, enter song mode and sign off.
Sign On and Song Mode Entry: Same as the Red duet
Sign Off: Both: "Bye Bye!" The big one does it after the little one says "Bye now" once.