You are Darkrai
To protect itself, it afflicts those around it with nightmares. However, it means no harm.
You’re the Pitch-Black Pokémon, and make others around have terrible nightmares. You don’t meant to do this, but it happens anyway. In order to spare others from your terrible nightmares, you hide on an island far from others. Later a special room was made for you at the Assembly, so that you could join in on meeting and sleep there with out bothering the others. When ever you go of a walk, you notice Cresselia is following you. She can get rid of any nightmares that you may leave by accident, so you guess its ok. She is your sister after all.
You are pretty much the living embodiment of darkness, and you can seamlessly melt into the shadows. This can be very useful at times, and you have decided to use it to watch people. Each night you can see if anyone performed actions on a player of your choice. You may use this on yourself. To do this, PM Joltik with Night X: Check username
You are allied with the Assembly
; you win if all threats to the Assembly are eliminated