Okay, so let's go...

THE FUNK TROLLS

They have a Queen AND a King.

SO BRANCH CAN BE A KING TOO.

It's clear that Branch loves Poppy but he's too embarrassed to tell her, for her part, Poppy can not tell the difference between friendship and love.

My theory: When the Trolls go to see the Funk Trolls, Queen Essence will make realized Poppy her feelings for Branch.

Sorry, I can not help but imagine that.