Mo initially presented as male when singing in the church choir, but with Zoey’s help in sorting through that internal conflict, Mo later shined like a star, just as the character’s mother predicted.
As Zoey’s gender-nonconforming neighbor, Mo became the titular character’s dependable confidante over the course of Season 1.
Even though Mo is perfectly comfortable around Zoey and others without shame or remorse, that wasn’t the case when it came to church and singing in the quire.
By the season’s fourth episode, Mo’s own backstory came to light.