Looking for more guys in this series with the cube heads please ( top left )
You're probably better off asking at the kidrobot forum or other dunny/munny sites.
blockhead dunny by kidrobot
found it. Tofu
Those are just dunnys/munnys. These appear to be custom-made by an amateur, given the low-quality of the paint jobs. The top left is by Devilrobots, repainted over, and the others are some variant of dunny/munny.
Here's some others: