I'm not an expert, but from what i understood it's how do you/ your character see the world,
"The Myers-Briggs Personality Type Indicator is a self-report inventory designed to identify a person's personality type, strengths, and preferences. The questionnaire was developed by Isabel Myers and her mother Katherine Briggs based on their work with Carl Jung's theory of personality types."
This is what google said about your character
"A Virtuoso (ISTP) is someone with the Introverted, Observant, Thinking, and Prospecting personality traits. They tend to have an individualistic mindset, pursuing goals without needing much external connection. They engage in life with inquisitiveness and personal skill, varying their approach as needed."