Haha! It varies. Aka's overall main design was produced rather quickly, but he's had changes since I first designed him almost two years ago, however, they've all been minor: like proportion adjustments, age adjustments, and such. I want to make a post with his evolution timeline to see his "growth". That being said, I've had a few characters for which I've made several drastic passes, drastic to such a degree, that they end up looking like entirely different characters when compared to each other. But that's all part of the exploration process :]