For some reason I find it absolutely hilarious that those are the forms of the rings that, out of every possibility in the world, best suit their abilities. I mean... Gokudera's abilities are directly related to him being able to keep his pants on??

Also, I took one look at this and the first thing I thought was "...they make diapers for that, you know." (I'M SORRY OKAY I COULDN'T HELP IT.)