If you didn't know, Elsa from Frozen is something of a gay icon. Her struggle to hide what is special about her out of fear that no one will accept her struck a chord with many LGBTQ people, as did her triumphant reveal and song celebrating her differentness. "Let It Go" is a come out song, read between the lines!
This idea has been floated for a long time. In 2016, Idina Menzel, who sings for Elsa, was asked about the popular suggestion that Elsa is gay. The hashtag #GiveElsaAGirlfriend was circulating on Twitter as talks about Frozen 2 were happening. She says hearing people think Elsa is a lesbian was a bit surprising, but she doesn't mind it.