Nothing too special. Not even sure these classify as CubeDudes, I think the proportions are a wee bit off. Anyway, The main picture is supposed to be Donkey Kong and the second is Metabee from the show Metabots.
About this creation
I've got a few new projects in the works right now. One of them is a revamp of an old Dark Augusto MOC. I know, the group and the theme is pretty much dead, but I still enjoy building them.
Moodswim's definition is spot on, a cube dude has a huge head (at least half the overall height) and the face must be made from the corner edge of the cube. That Metabee head would be ok if the body was on a smaller scale.
I'd say you've invented a new style of your own with that Donkey Kong. Instantly recognisable.