One of the basic rules writers are taught is make your protagonist believable. That can be interpreted as: make it easy to relate to them on some level. But it could also mean: give them an internal logic and consistency of behaviour.
But what if a writer invents a character for whom there are none of the realistic constraints associated with ‘normal’ people? Well, they couldn’t be human. You could not empathize with them, right? Even in the more morally simplistic world of video games the least sympathetic protagonist has some kind of flaw or disadvantage to overcome, otherwise there is no sense of jeopardy or challenge for them.
I once created a character who, though not possessing any superhero powers, was genetically engineered to be superhuman in some ways. Roidon Chanley was highly intelligent, charismatic and almost entirely without self-doubt …. and of course he had a lot of success with women. So he seemed like the writer’s enviable third-person alter-ego, having qualities I could hardly even dream of. One compromise was to not make him especially good-looking or tall; in The Hidden Realm, Roidon is described as having a striking, deliberate ordinariness (which was useful for him). Nevertheless, to have him as the main protagonist would be difficult to sustain. At best the reader could admire him, at worse they would think him implausible. For me it didn’t matter that he should be liked; even for for a first person protagonist that is not essential. Perhaps Roidon had become a writer’s self-indulgence, needing to be curtailed in some ways. Yet he lives on, in new iterations.
The Hidden Realm can be downloaded for free. http://www.feedbooks.com/userbook/10887/the-hidden-realm-the-full-version