Well, in the story I am writing at the moment, I use a new species of creature. Anyway, my main two characters (of this species) are serious, and the stuff which happens to them pretty dark/evil, but I also think I have space for a younger character. His would be a side story on the side of the main story around the other two, and I was just wondering because this younger character is still at school, is it a bad idea to mix the serious aspect with a lighter, more teenage-highschool side story? This character would also be in love (with a human), the traditional teenage romance kind of thing. My motivation for using the young character is to show a more human side to this species I have created, and to give a exterior perspective on the events that unfold concerning the other two. I was wondering if anyone has seen anything similar done before? Or has any advice on how to make the two storys combine well.