The announcer is a minor character in the trailer but he will be at the end. It is a non-visible character in the trailer but you can see it as the narrator. 

In the book, the announcer is like the trusted advisor for the Emperor and the Empress. After their seven-year search for their kidnapped son, they decide to replace him with someone who looks like him. The announcer is the first who objects. This character can be male or female. I prefer a female because the story is also about feminism, but feel free to do as you like.