First I would like to suggest that we add in the Orc bloodline. It would open up a very risky but fun way of playing as a crossblooded sorcerer with Abyssal and Orc bloodlines. Low health but very high potential strength in the later stages of the game.
Really, really, reallllllyyyy, want it added in (its my fav combination by far!)
Another would be the Shadowed Bloodline which always looked like an interesting one, as it focuses on the sorcerer remaining hidden and casting spells from within a darkness spell. It would give us more to think about when it comes to the use of the Stealth skill, something that could potentially be used in combat more.
Finally the Pestilence Bloodline allows us to potentially mindcontrol nearly anything, what with that and the Undead bloodline leaving very few things out of our manipulative hands. Since this is a singleplayer game, you don’t mind my nefarious deeds as I rummage around in the heads of others, right? ^^
Are there any other we can think about having added in?