Fascinated by psychographic descriptors and several segmentation type targeting I once took a personality test online. The tool provided by http://www.16personalities.com/ is a great one. Based on the test I got a ENTP-A, classification. I believe this is very close to me, based on some introspection. Here is a brief of the type:-
The ENTP personality type is the ultimate devil’s advocate, thriving on the process of shredding arguments and beliefs and letting the ribbons drift in the wind for all to see. Unlike their more determined Judging (J) counterparts, ENTPs don’t do this because they are trying to achieve some deeper purpose or strategic goal, but for the simple reason that it’s fun. No one loves the process of mental sparring more than ENTPs, as it gives them a chance to exercise their effortlessly quick wit, broad accumulated knowledge base, and capacity for connecting disparate ideas to prove their points.
Here is a link to my profile :- http://www.16personalities.com/profiles/5693eb3de7967
And here is some additional information on the type. Very useful information if one plans to have psychological leverage over me:- http://www.16personalities.com/entp-personality