Yes.
Nimdok was originally just a scholar and adventurer with a slightly unscrupulous, slimy side to him. On a whim, I decided he would have a daughter who traveled with him. This humanized him and made him into more of a family man, adding a nice bit of dimension to his character.
Similar stuff happened when I had him return to his homeworld. I got to get into various aspects of the culture and environment he was raised in, as well as his relationships with the people who were most important to his development.
Most recently, I decided to have a go at writing him as a full-on Jedi. Before, he was more of an independent entity who would occasionally have interactions with the Jedi from various factions. Now he is the Grandmaster of Knowledge of the Silver Jedi Concord. That decision has definitely altered how other characters perceive him - he is seen as a figure of importance, or at least greater significance, as well as being held to a much higher standard and heaped with greater responsibilities. Already he is beginning to regret taking this job, and part of me knew he would regret it, but I've enjoyed the experience of writing it so far. So eh. I guess I'll torture him for a little longer yet.
Edit: I am just now realizing that you probably were asking about natural development of a character within the story. Oops. Uh, well, let's say he has been slowly but surely becoming more honest, as his deceptions now have much more far-reaching consequences for him due to his position.