Under RAW, a Vampire must be evil. I'm not disputing that. However, what if I wanted a Lawful Good Vampire, and my GM and I are willing to let the violation of the RAW slide? Why is this? I want to play a Vampire Paladin.
Now, first off, this means no use of the Create Spawn ability. I can accept that. Secondly, the whole feeding thing. I can get around that by only feeding from evil people or willing people, and not killing them (there is nothing in the Bestiary saying a Vampire must continue feeding until the person dies). Thirdly, I realize I need to be very careful about when I use Dominate.
However, this brings up an issue. Positive energy. It harms undead. However, I CHANNEL it, despite being undead. How do I deal with that? Am I immune to my own positive energy? What about the party Cleric's? If one of us tries to flash fry some undead, am I screwed, or can I or the Cleric choose not to have me affected?