The narrator has a role of introducing the episode at the start of each episode, such as telling the viewers what happened the last episode. 

You are not visible in the actual story, but you may be a character in the story as well, if you wish. For the voice actor, we dont mind what gender the narrator is, but we would like you to be able to say the line seriously 

If you are looking on examples on how we would like you to say this, we would like it simular to how Lee says it or how Clementine says it in The Walking Dead

As the story develops, we will give you lines which give a summery of what has happened.