Eh, be warned, this is my first article here, so it might be kind of crappy. xD
Yes, her screen time is very limited, but what we do see of her I love. She's fierce, brave, daring, reckless, strong and heck, her clothes and make-up are beautiful. The one thing I would dislike about her is, her recklessness could be a serious disadvantage in a war.
Oh my God, I love Hama. Yes, she's a villain. Yes, she created the most evil form of bending that in time would be used to cause war and misery. (Oh, hey there Amon!) Yes, she captured innocent people for the simple reason they were from the Fire Nation. But that's what I love about her. She's so twisted she thinks she's doing the right thing. She's such an intriguing character and the episode in which we meet her (The Puppet Master) gives me chills. Her back story is incredible. One of the most complex and brilliant characters of the whole series.
I love Mai. Her hostile manner, her sullenness, her non existent aura...she's proof that you don't have to be a bender to be a powerful and skilled warrior. Her quotes are said in such a dull manner, but the words in them are brilliant.
"I love Zuko more than I fear you."
That brings me on to another thing I love about her. Zuko/Mai are incredibly cute together. And while I don't really think they stayed together for the remainder of their lives, I think they're a sweet example of young love. He really completes her. But then again, she's Mai. She doesn't really need anyone, does she?
Oh my goodness Iroh. His hard to understand words of wisdom always bring a smile to my face and his love for his nephew during hard times is so sweet. He makes me laugh, not only at his jokes, but at his gestures of kindness to all. Iroh is your basic kind and gentle grandfather - or uncle in this case - but underneath that tea loving old man is a warrior and one of the most skilled firebenders in the world.
Suki gets a lot of hate. I for one however, absolutely love her. Her courage is unmistakable and as much as some of you may dislike her; Sokka and Toph wouldn't have made it without her. Anyway; before I go of subject, let's get back to Suki. Her sarcasm and wit is hard to miss, but aside from that she's a born warrior, and an, erm, fanbender? Okay, I should keep puns out of this. Plus to top it all of, she's beautiful. Hey, who says you can't have beauty, brains and brawn?
I adore Aang. Yes, he ran away, yes he lied a few times, but he's still one of my favourite heroes ever. He's brave, he's humble, he's funny, and after some time (Only 100 years, not really that long, eh?) he accepted his destiny and went on to defeating Ozai and restoring balance and peace to the world. Also, the fact that it took him less than a year to master all four elements is pretty awesome in my opinion.
Zuko is another complex character. He starts of as an impatient, selfish villain with horrible hair - ugh that ponytail - but as the show progresses we see a new person. A scared, confused child who wants to restore his honour and has always felt second best. Like Katara said, he's often struggled with doing the right thing in the past, but he went on to becoming firelord and played a huge part in ending the hundred year war. And I said it before, I'll say it again. Him and Mai are just too cute!
Azula, Azula, Azula. Oh gosh, how I adore you. Your craziness, your socially awkwardness, your evilness, your insane self as the series drew to an end. Azula is mad. Her blue lightning reflects her personality. It's wild, uncontrollable by all but herself, it does what it wants, it's sharp, fatal and not exactly something you'd want on your bad side.
I adore Toph. She's strong, independent, witty, smart, admirable, a great bender, the creator of metalbending, eh I could go on! One of the things I most admire about her is the fact that she never sees her blindness as a disability but instead uses it to her advantage. Let's face it, if we were blind we would never be able to go through life a easily as Toph does.
Holy crap, SOKKA! I love you. You're brave and smart and above all, hilarious! From your friendly mushroom to Appa eating Momo, you never fail to make me laugh. He started of the show as a guy with no bending and a good sense of humour, but as the show progressed, we saw a warrior. A strong brave man with a a space sword and boomerang who - let's face it - is a charmer with the ladies. ;)