I used the American McGee Cheshire for 10 years and on most sites I still use it. I changed my avatar on this site (and a few others) to my own picture in 2010 because of this whole concept that people are to afraid of using their own picture as their avatar that people spew alongside the idea that people should use their real names online all the time. So, I figured people can see me when they speak to me.
It also felt more mature to do so or something. I don't know. I like the picture, though. It represents me aptly.