Elder: His age needs to go hand in hand with his bio, and both of those with the time period. For example, a really really old vampire is more likely to be sexist and racist, but with the manners and the like from the era he had actually been in. You know? 

Fledgling: Your bio is modern-day life bio, and then everything goes.dark, you wake up as a vampire, and you can't remember anything except your name

Local: how would they interact? I hadn't thought of this, but the big castle would probably have scary legends wrapped around it.