Thread:Mesektet/@comment-27729149-20150707052956/@comment-3581997-20150708203634

Not all in one category though there are a few that overlap into that;

There is Amimal Heroesl, as there are many animals which are just doing what is in their nature regardless of how it servers the plot, creatures like Momo and Appa.

There is Heroic Sociopaths, heroes who are chronically incapable of empathy, when sociopaths act as protagonists it has nothing to do with morality and their are acting purely out of functionality or self-interest, though they aren't mindless they have no conscience and are incapable of developing one think Beatrix Kiddo or Hayden Montag.

And there are creatures such as Golems and other possessed objects which are animate and server a purpose toward plot resolution but have not will outside of completing their designed task.

If you wanted to create your own category for it, go right ahead. However if you are just looking for references to those sorts of heroes check out those.