• INTP-T (http://www.16personalities.com/intp-personality)

INTPs are known for their brilliant theories and unrelenting logic – in fact, they are considered the most logically precise of all the personality types. They love patterns, and spotting discrepancies between statements could almost be described as a hobby, making it a bad idea to lie to an INTP. This makes it ironic that INTPs' word should always be taken with a grain of salt – it's not that they are dishonest, but people with the INTP personality type tend to share thoughts that are not fully developed, using others as a sounding board for ideas and theories in a debate against themselves rather than as actual conversation partners.

This may make them appear unreliable, but in reality no one is more enthusiastic and capable of spotting a problem, drilling through the endless factors and details that encompass the issue and developing a unique and viable solution than INTPs – just don't expect punctual progress reports. People who share the INTP personality type aren't interested in practical, day-to-day activities and maintenance, but when they find an environment where their creative genius and potential can be expressed, there is no limit to the time and energy INTPs will expend in developing an insightful and unbiased solution. Further, with Thinking (T) as one of their governing traits, INTPs are unlikely to understand emotional complaints at all, and their friends won't find a bedrock of emotional support in them. People with the INTP personality type would much rather make a series of logical suggestions for how to resolve the underlying issue, a perspective that is not always welcomed by their Feeling (F) companions. This will likely extend to most social conventions and goals as well, like planning dinners and getting married, as INTPs are far more concerned with originality and efficient results.

The one thing that really holds INTPs back is their restless and pervasive fear of failure. INTP personalities are so prone to reassessing their own thoughts and theories, worrying that they've missed some critical piece of the puzzle, that they can stagnate, lost in an intangible world where their thoughts are never truly applied. Overcoming this self-doubt stands as the greatest challenge INTPs are likely to face, but the intellectual gifts – big and small – bestowed on the world when they do makes it worth the fight.