Are You Raising An Introvert? (page 14)

Xanthippe

You're the Healer. Healers are true idealists, always looking for the hint of good in even the worst of people and events, searching for ways to make things better. While they may be perceived as calm, reserved, or even shy, Healers have an inner flame that can be harnessed for magic. The Healer introvert type is a shaman to his or her tribe. You carry within you the ability to understand problems and connect to the root cause on a deep level. You're naturally spiritual and find it easy to access the spirit world. You have incredible potential to do good. The world needs you!

😜

OneEyedJoe

You're the Mastermind! Wow, it sure is lonely at the top and being one of the rarest and most strategically capable introvert types! Masterminds, like you, know this all too well. Masterminds form just two percent of the population! It's no surprise that it's often a challenge for you to find like-minded individuals who are able to keep up with your relentless intellectualism and chess-like manoeuvring! Masterminds are imaginative yet decisive, ambitious yet private, amazingly curious, but they do not squander their energy. You are truly one of a kind!

Looks like the test is a slightly simplified myers briggs test. I think I recall the INTJ type being referred to as the mastermind as well.