Myers-Briggs Type Indicator:
ISFJ / Protector
A person who is ISFJ in the Myers-Briggs Type Indicator is said to be a protector. This person is Introverted, Sensing, Feeling and Judgmental. They tend to be on their own, like concrete information, feel carefully about how to handle the information and make judgments based on that.
To me, Aragorn from Lord of the Rings fits well into this group.
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