TNA's issue has never been personality, or the development of character both of which they excel in tremendously. Rather, the issue has been and has always been in how said characters were booked.
Do you even know what character development means? Probably not based on this sentiment. Character development means developming a character, something that TNA is and always has been incredibly bad at. There is absolutely nobody in TNA right now that has a character that is remotely consistant with what they were doing a year ago. That's not development.
Before the inevitable chorus of "what do you expect, no heel turns?", let me give you a little example in what I mean, and what should be obvious to you but apparently isn't. Take the two big turns that the WWE has done in the past year. CM Punk went from being wholesome to being a tosser fairly organically, and slowly, but did it without really changing his character. He had opportunistically taken the title before, and had always been straight edge, but his character developed to be more preachy. Randy Orton is basically exactly the same as he was before, except now he gets put in feuds with heels and he is more accepting of the fans. Again, development.
Take two major turns that TNA has done. Styles has gone from being a wrestler and TNA devotee to the core, to being Ric Flair-lite. The obvious way to turn him heel would be to make him annoyed that other people get promoted above him and that he is the cornerstone of TNA. Instead, TNA have him, totally without any rhyme or reason become best buds with Flair and then become a clone of him. Styles is fairly tame in comparison to some of the shit TNA get up to, take someone like Eric Young. What do we know about him? Absolutely nothing. He hates America, then he seems indifferent to eeryone, then he's a face, getting beaten down by The Band, then he refuses to join them, before accepting their offer a few weeks later, for absolutely no reason. That isn't development, it's the opposite. ******ation if you will. Not only i YOung's character nor progressing with any consistency, he isn't even being allowed to establish a character to develop in the first place.
I'm not a blind TNA basher by any stretch of the imagination, but what TNA really need to do right now is to make episodic television, and not a two hour directionless clusterfuck.