A fair few characters have just as good if not better character development. Some even without the constant changes to their origin because of the creatively bankrupt people that get assigned his comics.
What about Rogue? I can get behind her in that department imo
You have a young girl who starts bad due to manipulation. Her powers make her feel miserable and isolated. Girl meets guy and those feelings of inadequacy and fear of being manipulated rise again. As the years go by, she not only becomes more capable, but more independent. "She don't need no man" begins. She becomes a formidable X team leader and is lowkey one of the X-Men's better strategists. She becomes denmother and warrior to the new gen of mutants and continues to lead new and higher profile teams
From Dc I'd say Nightwing, Wildstorm I'd pick Grifter, Image, I'd say invincible, and Darkness from Top Cow
Nightwing is undeniable if you've read Batman comics and watched his progression from little side kick to being Batman's equal and arguably superior.
Grifter was just a bargain basement Merc but then they progressed him to a coda warrior and showed him having that up and down period while he was powered.
They developed his character from before he was even born, documented his infancy in the ship, childhood on the farm, high school and college years, first job, friends and love interests and Heroism until his death and after he came back. Has to be Superman, They developed him pretty thoroughly if you ask me.
Really? I think after her first team she started showing out. Uncanny Avengers not so much, but I also don't think the writer understood her. But Utopia when the hunter wolf things returned? And X-Men Legacy had her consistently devising new strategies in unknown and alien situations.
I would definitely put get above Storm and Nightcrawler as far as team leader and strategist goes.
Superman has some pretty great character development imo, it just all tends to take place before he becomes the established Superman that slaps around Darkseid and meets up with the Justice League for dinner on Tuesday. Look at Morrison's Action Comics run. Or Birthright.
But when he hits "Superman status", any problems he has tend to either be exterior ones, or ones where he has to remind himself of the man he is. He can have self-doubt and worry, but he still comes back to being Superman.
She's all right. I just wouldn't use the word "great" is all.