Write about a character who happens to be a teenager. The catch? This character has a guardian spirit who follows them around, and may at times offer assistance. Double catch? Unfortunately, this 'guardian' is a very powerful, very angry, and over-protective dark spirit.
The MS MONSTER... It almost becomes an entity of its own. It gets in between us and others, it swallows our energy, it fools others into believing we are well because we look good... But the MONSTER is always there, taking from us. (Joker quote)