A few of my characters have gone through some sort of an evolution in terms of appearance - they have had mostly minor tweaks in their faces or body, but still maintain their personalities.
I only created Emilio Mondez in April 2012, but after looking back at the first few pics featuring the character, I realized just how much I have improved since then. As the months went by, Emilio looked less like something I would usually draw (the Garfield-esque eyes, the soft line curves) and transformed into a shady, more realistic-looking character. I think that's why Emilio has become one of my favorite characters to draw - I like to occasionally break out of my usual style and try something different, and Emilio is the perfect example.
Who knows if Emilio will continue to change in terms of appearance...I do know that his sly expressions and devious personality will remain intact...much to the misfortune of those who encounter him.