There appears to be a fan-created design for Duo Jr. that's popped up on pixiv and is already being embraced by fandom (I've seen someone cosplay it already, even)
http://www.pixiv.net/tags.php?tag=FrozenTeardrop
The tag, for those that can browse pixiv, or if not:
My friend informs me he's cursing his dad out XD He looks like Duo if he stole Squall's coat...