According to the Myers-Briggs personality test, Sirius Black was an ENTP. This stands for Extroverted, Intuitive, Thinking, and Prospecting. Sirius Black was a very creative person but was also bold, which explains how he was able to wield so much power and develop innovative charms. Plus, he was fun, restless, and very opinionated. This also explains why he was so popular but also why he was rebellious.