Zuko, because he learns the true meaning of fire bending. But has anyone noticed how HOT Ozai's abs are!?

But his Uncle always new the true way, he can shoot lightning and redirect it, and he breathes fire, plus he taught Zuko the basics.

Isn't it obvious. She is the only one that can shoot Blue lightning.

18wanda - Iroh and Ozai can shoot lighting too. I picked Azula since she is a Firebending prodigy. It's hard to tell though.

she has blue fire

It has too be Iroh, Iroh knows everything bout fire bending and then his younger brother Ozai is the strongest.

It has to be obvious h's the fire Lord, you don't see Azula flying like Ozai, He just has so much fire power. At the end Zuko and Azula were evenly matched in fire bending, over time I'm sure Zuko will be a better fire bender then Ozai

Iroh's my favourite, but Ozai is obviously the strongest. I believe Iroh could have enough power to be the Fire Lord, but hey, he was a mere general of the Fire Nation's army.

Thats because he never believed in what the Fire Nation was doing, He was actually in line to be Fire Lord,until his son died, and he is the only character who can Bend and redirect lightning

Hey don't forget Zuko and Aang can redirect lighting, and Ozai and Azula can bend lighting

irho is not the strongest he couldn't even stay alive long enough

irho is still alive, in the show

Ihro is the only one who can do both (bend & redirect ligtning)

yes,he's cool n good

Iroh is the best FireBender, because he never was evil (in the show)

Either Azula or Uncle Iroh. The rest are powerful, but I definitely think Azula and Iroh are the strongest.

Still sticking to Azula. Just gonna copy and paste a prior comment; - Azula has Blue fire (supposedly hotter than any other fire) on the show. This is something unique to Azula and Azula alone. Where as Bloodbending is not unique to Katara. Others have done it before. Plus she can only do it during the full moon whereas Azula's blue fire and lighting are present at all times.
- Azula has lightning. At the time few benders could produce it and fewer could redirect it. Azula was one of the few who could produce it and Katara has no way to redirect it. In fact water is rather conductive of electricity.
- Azula killed the Avatar (you know, master of all for elements, most powerful being in the series). Zuko searched for a whole season and couldn't get him. Azula got him within a few episodes of looking. And she did so rather effortlessly. If it weren't for that Spirit Oasis water he'd have been dead. Azula punched out Cthulhu.
- She's a psychopath. If anything that just makes her more dangerous because she lost touch with her morals. And her moves are unpredictable.
- Azula also has some knowledge of acrobatics and weaponry. Katara without her bending was shown to be rather helpless and Sokka had to give her a hand. Whereas Azula (as shown during the eclipse) was successfully able to take on 3 benders and one skilled nonbender, all without bending. She knows how to do these crazy jumps and flips and knows how to throw an knife or two. So at the loss of bending she can still kick ass.
- Azula was also a child prodigy. As mentioned in The Search, she mastered about 14 forms of firebending at a really young age.
- She pretty much won every battle she was in. She took on all the Kyoshi warriors. She beat Katara and the gang on multiple occasions.
- Azula is dangerously manipulative. She manipulated the Dai Lee into helping her. That's how she took down Ba Sing Se. She manipulated Zuko into joining her again. She got the Earth King.
- And last but not least, Azula took the Dai Lee and Ba Sing Se (something that even an army couldn't do). Something the Fire Nation struggled to do in a 100 year time period, she did within a few days. Something Iroh failed to do.
- She was also shown to have been able to breathe fire like Iroh.

I strongly believe that the only reason Katara beat her was because she went insane. Plus Azula has no qualms about killing people. And she did beat Zuko...even in the final.

All of you are wrong we all know that the most powerful firebender is Jeong Jeong I mean without the assist of Sozins comet he was able to create and sustain a massive firewall that blocked Zhaos fleet of ships on top of water and during the comet was able to sustain flight the one thing everyone says makes Ozai more powerful he is the most powerful