No worries. Like I said, I just copy and pasted them into docs as I first created them. Once I make my choice I'm going to play around with them a bit and edit them to fit this RP. So if I end up picking the twins I would, of course, make them pure-bloods.
Although the idea of having a half-giant bad guy sounds pretty darn cool (esp since he's from a pure-blood family), that guy's personality would be very difficult to twist towards the dark side... it's possible! but it would require circumstance (i.e. everyone showing prejudice towards him for being a half-breed, and the future bad guy being the first to accept him and fill his head with ideas of him not being faulty but everyone else being the ones that are wrong and so on).
The twins on the other hand would be easy to shift to the dark side, and I wouldn't need help from anybody to do it. This would allow me to be more integral to the plot from the beginning than being dragged by it.
So really, it's more a question of if I go with the good guys or the bad.