Could be gunduck, gundonald duck, you name it!
Awesome customization, wonderful use of parts, clean paint job!
As I can see, the modeler used some parts of HGUC Kampfer's head and half of the legs and arms, also he used Kshatriya's binder for the body and Gerbera Tetra for the other half of legs and arms.
image from ToysDaily
modeled by rorop