Well, he was the one who told Aang he had to kill Ozai. But then @ the end it seems like he still kind of cares about him.

He could, since he wanted to know more information about his mother.

I don't think Zuko would have cared out of compassion. I mean, Zuko even said that it was Aang's destiny to kill him, and he said it with a straight face. Zuko seemed pretty angry when he talked to Ozai in the prison cell. I don't think Zuko would've cared if Ozai had been killed. We have to remember that Ozai was never really a father to Zuko, so why should Zuko care for him like he was family? I think he would care if Azula died, though, as shown in TSR because she was partially there for him as a child. She at least warned him that Ozai was planning to kill him.

Zuko:"You're going to have to take the firelord's life before something..."So i'm not sure

It's actually very hard to say. There are too seperate lines from Zuko in the finale that both offer differing answers to the question. When Zuko asks Iroh to kill Ozai in "The Old Masters", he slips unconsciously calls Ozai "the Fatherlord", instead of "the Firelord", indicating that Zuko still thinks of Ozai as his father, at least to a certain degree. However, at the end of "The Phoenix King", we get Zuko's line "You should be grateful that the Avatar chose to spare your life". The way Zuko says it makes it sound as though he is not at all sure that sparing Ozai was the right decision, and possibly even begrudges him having been spared. So it's hard to say. I'd say that it's definitely possible that Zuko is just as confused about the issue as we are.

thats like luke skywalker killing darth vader...right???? hehates him so he doesnt care.....but he's pist that he's his father

i think he would feel a little bad, but Zuko probably wanted Aang to do that, but he didn't

meh

Of course he would have cared! The fate of the world hinged on the death (or simply defeat) of his father. OK joke time is over.

It honestly depends on how loosely you use the word "cared". If his father had been killed after all, would he have felt a bit sad? Regretful (losing his actual father)? Callously indifferent? Zuko always wanted his father to love and accept him pre-DOBS as confirmed in said episode. But once he finally realized that the "love" and "acceptance" he was looking for wasn't to be found in his relationship with his father, as well deciding that he has to do the right thing and his father is in the way of that, he lost that drive. He even said that his uncle was more of a real father to him showing that he now saw Iroh as his father figure. I will say that Zuko will have cared in the sense that he was losing his actual father but I don't believe he would have been shedding any tears over hit. Even though the redeemed Zuko entitled him to throwing away his anger and hatreds (I think so :p), he still bears a big grudge against his father. That's not to say that would make him jump into the air shouting, "YIPPEE!! HE'S FINALLY DEAD!!" or anything, rather, relief and happiness that the fire lord and subsequently the war had ended but a little grief over the knowledge that his actual father, and their relationship as dysfunctional as it was, had to end in such a way.

[/deposits 2 cents]