I have studied almost every personality map out there. Some people believe in personality, some think we are too complex for personality. However, characters in books are not as complex as real people, they can't be. Characters are shorthand notation pointing to a cutout into which you fill in the blanks. When the cutout resembles reality, it works, when it does not, it jars the reader out of the story. Play it safe and stick in the hero in a hero's story, but for more interest, you can try to get creative at this level. There is a range of heroic types from reluctant hero to paladin and some overlap in skill sets and personality with other story types. You will find heroic personalties in trickster stories (The Maltese Falcon) or in bride stories (Underworld). Sometimes, as in the portrayal of Captain Kirk above, the change of personality by the actor and the writer, change the kind of story that can be told. Most teachers of writing go with popular personality types and just focus on how they are broken. I find this insanely irritating, but it works.
Personality maps are all over the place. Astrology is a good map, but doesn't apply to
people too well. The Enneagram is a good map, but again, the topology doesn't seem to work
very well. When you were born or where you are on the chart may not be logical according
to the map. The Myers-Briggs Personality Test and the Big Five were based on observations
of people and try to fit types, but don't work well for story characters. There are god
and goddess maps, cartoon maps, maps based on actual psychiatric problems and really frustrated
maps like the current declaration that there are only three types of people: self-involved,
middle, and role models! Here I will go through the maps that you might enjoy exploring
in more detail and tell you why they work and don't work, before I settle on one I find
that works really well for characters in stories, the Enneagram. It is a map based on
spiritual flaws. Because it is a stress map, and characters are under stress, it seems
to work well for character portrayals.