Dear Members:
A good idea for uh, character/plot development would be to have a detailed account of their motivations/agenda for their stay in the Regan Manor. I'm not saying to write it all out now, I'm just suggesting that you can start forming how they got there in your head, so you'll be ready to flesh out the specifics when the time comes.
Take Aiden for example:
He's a journalist, he's in the Regan Manor looking for a good story. I have already started to form vague ideas about how he was led to the house. He noticed the patterns in other missing persons cases, and further digging led him to a missing drug deal in New York, and found a small photo of the Regan Manor in the drug dealer's apartment. etc. I also made up a 'story' for his cover, that he was in the Manor searching for a lot friend, Emma, who disappeared the day of her wedding. And if someone were to look, there would be a record of that happening, but she was most probably a runaway bride, and her 'disappearance' has nothing to do with the Regan Manor, it only serves has Aiden's cover. etc etc.
Things like that, little details prior to them moving into the manor. Aiden doesn't have a 'dark' past like the other characters, so y'all will have much more to work with than me :) Start thinking about them so you won't accidentally contradict yourself when you make up things on the spot in every para. consistency is quite important, if I say so myself.
these are just some tips! Take them with a grain of salt haha
-howie