You know what, I'll bite. Some examples of character development (from the top of my head):
Arrow: Oliver doesn't want to be a vigilante anymore because he thinks his job is done when he stops the undertaking, and he feels he failed to save Tommy. Diggle tries to get him to realize that he's meant to help people as The Arrow in general, not just use his vigilante identity to stop one evil group or quit because of what happened to Tommy. Over a series of events (I can't quite remember if it was wrapped up in one episode or not, its been awhile since I watched), Oliver realizes that he should stay a vigilante and protect Starling City, and that his job didn't end with the undertaking or Tommy's death. He goes from wanting to avenge his Dad and stop the undertaking in Season One to trying to protect the city in Season 2 through a series of events that developed him as a character.
Legends of Tomorrow: Captain Cold joins the team mostly to steal from various time periods, but slowly becomes something of a hero because of the things he's been through.
Star Wars: Han Solo originally just wants to get paid for a job, but by the end is a fairly loyal rebel (or at least loyal to his friends) and helps them take on the Empire even when it causes problems for him.
So, i've given some examples. Now, I guess its time for someone to explain how none of those are examples of character development