Love your metas!!! Question, I have read fics where Edward accidentally doesnt drain Charles Evanson and he turns into a vamp. If in some world this happens and Charles went after the Cullens for revenge, would Carlisle still be a pacifist or nah?
I mean, that's not unlike what James and Victoria did, and in both cases Carlisle proved that he considers self-defense to be morally acceptable. He's not an absolute pacifist. By human considerations he's really not that radical, his ideals are 1. don't kill people on purpose, 2. see rule #1. He only becomes radical because he's a species that kills to survive, and killing kinsmen is so normalized that the Volturi don't even have a law against it.
That being said, though, I find this scenario... questionable. How would Charles even know where to find the Cullens? How would they know they existed, even? If Edward did a villain monologue I suppose he knows Esme is a happily married bloodsucking demon now, but if Edward didn't then Charles is Vampire Victim #20901 with no knowledge of nor intent to pursue the Cullens.
... but, knowing Edward, he would not be able to shut up.
More, let's say that Charles wakes up a vampire, and Edward had a villain monologue so Charles knows Esme's involved. He wants revenge.
How does he find the Cullens?
Edward might have brought up Carlisle during his villain speech. But he might not have brought up that Carlisle lives among humans, nor the Carlisle uses his own name. I'd be surprised if Charles assumed both of those things to be true.
Charles is searching for three vampires, not a doctor Cullen and family somewhere in America.
Between the three days of his transformation passing, and the rush of being a newborn, the odds of Charles deciding to kill the Cullens and being put together enough to think to follow anybody's scent before Edward's scent has disappeared altogether, he's not going to be able to follow them in that way.
No, what Charles has is the memory of what Esme looked like as a human, and what the monster that killed him looked like. These memories are human and unclear, and likely failing him even as he tries to think about them clearly. He only met Edward once, it was highly traumatic, it's likely he wasn't focusing on committing Edward's features to memory.
Charles is an abandoned newborn with only the obsession of half-forgotten people to guide him. If he ever finds the Cullens, that will be luck and coincidence.
But I don't think he'll make it that far.
This guy was a violent and aggressive human. Now he's a newborn vampire, ignorant of the Volturi to boot.
I imagine he has a series of indiscretions, living the grand newborn life, which comes to a brutal end at the hands of the Volturi.
From there, Edward, who per the timeline was off the diet at this point and killing rapists, gets a knock on the door from the Volturi, as Demetri could track him from Charles' memories. It is illegal, after all, to abandon a newborn, and to do so carries a capital sentence for both newborn and creator. In Edward's case, his progeny aroused the attention of the Volturi, so he can't use the "No harm was done!" defense.
Given his gift, though depending a bit on who has been dispatched from Volterra, Edward is likely offered a spot amon the Volturi. It is a nifty gift.
Edward being Edward, he's not doing that. He is much too proud, and would sooner welcome the romantic optics of being killed by the Volturi. He is executed, and Aro sends a letter to Carlisle letting him know that his progeny broke the law by abandoning a newborn and has been summarily executed.