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And the Colors Slowly Come Back by Bibbledoo
He loses his colors and the world around him does, too. As he moves on slowly, the colors come back one by one until he can sing and regain his true colors. (I really did look at Gris and look at Trolls and wanted to combine the two for some reason.)
Crossover - Trolls & GRIS - Rated: K+ - English - Family - Chapters: 1 - Words: 3,123 - Published: 7/24/2020 - Poppy, Branch