If I remember correctly they're not there when you go through it again, but you can easily fix that by deleting a saved game. However, did you know that when playing the game on Hard and Nightmare there are rare pages that only show up in those difficulties? They're actually the more interesting ones.
It is so hard to find a new main. I ALWAYS go back to Guile because I just can't get over his awesome defensive moves and the amazing reach of a few of his moves. When I get bored of him I feel like I need someone else but I don't even know where to start.
I really wanted to main C. Viper but man her timing is so weird for me.
@Nexas: It may seem like that because you constantly had to fight mages who used it, but that's why you had to fight them in the first place. Because they used it. Don't forget there are hundreds of other mages in the Circle that we don't even see. With that considered there's definitely a majority of mages who don't actively use Blood Magic. That's like saying Kirkwall is inhabited by Dragons because you fought a few outside the city walls. The only reason you see so many is because it's a game and... you need to kill something.