I made the initial Doop for myself, he being one of my favourite of the newest characters to come along in the past few years. The second Doop was made for the Doc Allred because he wouldn't exist without the brilliance of Mike (and, I'm sure, Peter Milligan too). And the third went to Darwyn Cooke because he and I worked together on the Wolverine/Doop mini-series. I absolutely love the way Darwyn drew Doop.
Construction-wise this was the first character to get fingers. Until now everyone had mitten hands.