Before I begin a character sheet, I have a few questions:
1) I love the backstory and I'm intrigued about how the portal even opened up.  Would it be far-fetched that my character be from a neighboring planet? I have a whole story set up and she happens to be one of the characters.
2) Speaking of the character, she's an alien.  Humanoid looking but once you see them fight, you'll understand the differences.  I also have some information regarding their anatomy and physiology.