Who do you think it will be?

Oh, it definately wouldn't be Zuko's crazy sister! Neither would it be the guy I made up for Nick Mag's character contest. He may not be on the Fire Nation's side as far as the war goes, but he's not that good at firebending, himself.

Why couldn't it be azula?

Yeah, AZULA! Let's try and Imagine THAT! Anyway, I rekon It'll be Zuko and Iroh.

my money is on uncle(Zuko uncle) he's calm,caring and NOT crazy and he doesnt like the fire lord

It could be that one guy that tried to teach him in the book of water or my bet is Zuko will join them and teach him.??

Maybe Jeong Jeong will return and continue to teach Aang firebending.
Even if he doesn't return for the porpose of teaching Aang I still hope he comes back for at least one episode. He was pretty awesome.

Yeah, you know, I wouldn't be surprised if it DID turn out to be Zuko, and possibly Iroh also, now that I think about it... Out of ALL the characters in Avatar, I think it'd be pretty safe to say that Zuko is the one who changed the most, and not only changed, but changed the most DRAMATICALLY. At the beginning of Season 1, he was a rash, hot-tempered, spoiled young prince who was willing to do pretty much anything to capture the Avatar and regain his honor in the eyes of his father. And then, life as a common villager, and then later a refugee, changed him...opened his eyes to the ways of the world as he'd never seen before. By the time the episode 'Zuko Alone' rolled around, we see him bonding with a local village boy, and helping the family to repair their roof, and being a mentor to the little boy, and defending/trying to protect the boy from authorities. Zuko is rapidly gaining an ever-growing sense of right-and-wrong, with each passing episode. He is definitely NOT the person he once was. I think that point was made painfully and bluntly obvious in the show.

Combined with the fact that he _might_ just get fed up with the frustration of "never being good enough for Dad", no matter what he does, and that Azula's always going to be one-step ahead of him, etc, Zuko MIGHT just switch sides on everybody, and team UP with Aang AGAINST his own Fire Nation in the end.... And he could be the one to teach Aang Firebending.

It's not that inconceivable. In fact, it makes perfect sense. It's been done before, with awesome results: Pietro Maximoff (Quicksilver) betraying his father Magneto and the rest of the Brotherhood, to join up with the Xmen; Jinx switching sides from bad to good in the Teen Titans TV series, etc.

Zuko is about at the half-way mark right now, between the 'good' side and the 'bad' side. He's got MUCH more of a conscience now, than he had back in much of Season 1. I think it'd be really cool if it really DID turn out to be Zuko who was Aang's Firebending instructor, ^_^;;

Also, on the topic of 'who will teach Aang firebending'... no, I haven't forgotten about Jeong-Jeong... Yes, he did teach Aang some firebending, (enough that Aang was soon gleefully tossing around fireballs...). But I don't really consider him "THE INSTRUCTOR" who was meant to teach Aang firebending... Jeong-Jeong was barely in half an episode, and the last we saw him, he'd vanished into thin air (a.k.a. the woods?)

Zuko, they been setting up for it.

I think it's gong to be Zuko. Becuase, aang has tried to be Zuko's firend for a while. (the blue spirit episode) and also, it just makes sense. I don't knnow i have a feelign that Iroh is going to die and Azula.. no. nooo she's Aangs new major enemy.

Aang will not be taught by one person alone, BUT 2!!!!!!! (Jaws music) Zuko AND Iro. DUH!!!!!!!!!!!!!!!!!

Jeong Jeong
the deserter guy.
Why, well why else did they ever introduced that character only to know that Zhao can't control himself??? or so we know that katara can heal peeps... don't think there just has to be more too it...
A possible story twist might be:
jeong jeong (deserter guy for short)
Meets aang and the gang (haven't got a clue how they are going to meet haven't thought that one out.) and starts training aang, then duo to a strange twist af fate fire lord ozai appears, to save aang and his gang the deserter guy fights the fire lord... When aang and the gang rid themselfs of ozai's "henchmen" they/aang want(s) to see what has become of the deserter guy. They get to a place of wich they can safely watch the fight, after a long and ferocious fight the deserter guy dies.... (to shorten the post a bit)

Now the part in wich aang meets his new firebending teacher (to get back to the point).

When aang and the gang are back (at some place don't know what yet) they come across iroh and zuko. Zuko ofcourse tries to capture aang but aang has had enough of fighting meaningless battles and tells the tail of the deserter (how he dies etc), then iroh steps in and says now it's enough, my brother has gone too far he has to go down and i'll teach you how to do so aang by learning you how to fireband....

(the end is still bit open cuz iroh could also be zuko but my personal favorite for the part is iroh).

just my thoughts about it...

oh yea about iroh's possible death... it might be that he dies somewhere in the first few episodes of the 3rd season but i also think a possible twist may be that the directors of the show let him have an accident wich changes his voice (possible accidents may be 1: an wound caused by someone who tries to kill him and zuko.
2: my personal favorite, He drinks some sort of plants and the affect is ofcourse that his voice changes.

those are my ideas about possible plot twists.

PS: please don't pay to much attention to some grammar mistakes etc. cuz english aint really my native language so mistakes are easy to make.

I think it will be Iroh. He seems to know a lot.