Indigo is a fanmade Sing-a-ma-jig. He is indigo, has black triangle eyes, a pink nose, a black mouth, the same arm pose as the skeleton Sing-a-ma-jig, has the same shape of ears as the Midnight Sing-a-ma-jig, his feet are almost the same as the lime one, and he sings "I've Been Working on the Railroad". He signs on, enters song mode, signs off the same way as the big one in the Gold Sing-a-ma-jig Duet and has the same voice as the big one in the Gold Sing-a-ma-jig Duet as well. He has a the same shirt design as the dark purple sing a ma jig but color swapped.
Indigo sing a ma jig

This is what he looks like.

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