1. Post a comment with the journal of a character you've considered apping. Make sure to put the name of the character/canon in the subject heading and post a comment as if they're already in the game! It can be a voice post, video or text post; it can either be an intro or a "been there a while" sort of deal. Anything goes!
2. Tag around with others - potential characters or characters who are already in the game - to see how well they fit.
3. Get a better idea of how well they'd work out in game, and app or not app accordingly!
4. Have fun! And we pretty much just mean "app" by that last one, fufufu~