Yeah it's obvious that my interests sit squarely in OU characters being ported in by one mechanic or another, but on thinking about AU I'd worry about it making things too inaccessible for people not familiar with Destiny. Letting characters and players learn about the world through playing in the game is easier than expecting them to read up on it all enough to build an AU application. I mean, if I was running it I would definitely allow Destiny OCs as well, but OU ports seems like the strongest way to have it as a game in general.