Gotta say, the anatomy and the facial structure of some of the older ones are pretty bad. Well, not bad. But not good. Like, 5/10 art. But oh well. Ike also has a suuuuuper long nose XD
As for the newer ones, the hair seems really chunky, kinda like what you do for your sprites.
I just think that throwing in a few more strands here and there would make it look better. Yay, personal opinion.
Don't worry, Ken! You're still 5th best in my books! XD