Right, I thought you were talking about the way others see you in COOP.
So the list is:
the bone work
the recoil
the running animation
the way your gun sways when moving the camera
revamp all of that
having more than one main attack melee animation
Of the above points, the only one I see has any meaningful merit is n.6 (but it would be a plus, not something lacking).
As for n.1 I'd ask for @SnowDog1942's expertise on how to handle it.