RubyRedRhapsody
Sokka? ...He's a sarcastic sourpuss with little character development, but he's also funny. ...FAVORITE CHARACTER! <3
He has tons of character.
He was burdened at a young age by the father he looked up to by promising to protect the entire village when he was nine.
He kept that promise, losing a lot of his childhood in doing to. He learns to overcome cultural sexism and recover from Yue's sacrifice.
He struggled with his love for Yue because of her betrothal even though she was of higher rank and decided to abandon it herself.
He kept reuniting with his father, only yo lose him to duty and the fire nation time and again.
Because of his childhood, he can't stand feeling useless when it comes to protecting and helping, yet he will fight and confront impossible odds.
And that's my lazy footnotes. You can check out SFdebris's analysis of the whole series and how well Sokka's developed there.