That's exactly right. It is as Winter said. Original characters with different plot. Can have abilities from the original series, but can make up your own (otherwise there wouldn't be enough if too many people joined)
You would need to discuss your ability, your level (from a 'The Gamer''s perspective) and etc. I won't be on for the next two days cause of exams. Feel free to throw your ideas in and talk to each other.