All the information in this post comes directly from Personality Type: An Owner's Manuel by Lenore Thomson. I own nothing. Please excuse any typos.
“ENTPs are aggressive, expansive, and opportunistic in the best sense of the word. They have no doubt about the importance of what they're doing, and they're at their best when they feel challenged and have to improvise. They want to be inspired, are rarely content with things as they are, and tend to have many projects going at the same time. Others are excited by, even propelled by, the relentless tide of their drive and enthusiasm” (209).
“In their self-motivation and hunger for experience, ENTPs are not unlike the ESTPs. Both are competitive and derive energy from playing the game very close to the edge. They know more than they can verbalize about how well they are getting across, and they use this knowledge pragmatically—with an eye toward winning. These similarities are largely the result of supporting their Extraverted Intuition with the impersonal wholistic logic of Introverted Thinking” (210).
“Unlike Extraverted Thinking, which is conceptual and generalized, Introverted Thinking motivates strategic action in a specific situation. When ENTPs use it, they don't start with abstract rules and apply them, step by step, to bring about a goal. They recognize themselves as part of an ongoing process, and they keep adjusting their behaviors in terms of the whole picture” (210).
“When combined with Extraverted Intuition, Introverted Thinking can be highly cerebral, and it usually involves a complex imaginary pattern of relationships. For example, an ENTP might enjoy playing chess, because such types can usually anticipate the results of many potential combinations of moves. An ENTP salesperson might pull together a host of small details and recognize in one mental image how a customer is likely to respond to a product. An ENTP cultural historian might see how a seemingly insignificant detail in a popular movie actually defines the underlying ethos of a culture” (210).
“Such types are so alert to systemic logic that they often see relationships among elements that no one has ever considered before. In this respect, their intelligence is more fluid than an Extraverted Thinker’s, unpredictable, and given to idealism” (210).
“Indeed, an ENTP's curiosity, drive, and force of will are highly charismatic. These types are innovative, imaginative, and exciting to be around. They often attract people who rely on their energy and initiative to galvanize their own ambitions. However, ENTPs are not necessarily aware of others' needs or weaknesses. Their focus is usually on systems and how they shape reality” (210).
“Once engaged, ENTPs are completely invested in their work— eating, sleeping, and dreaming their particular vision. A quote attributed to comedian Jim Carrey accurately conveys the viewpoint of many ENTPs: ‘It's hard for anybody who's with me not to feel starved for affection when I'm making love to my ideas’” (210).
“For this reason, others can experience the ENTP as alternately seductive, impatient, and indifferent, and such types are not above intimidating people with the mercurial nature of their mind. ENTPs assume that everyone is as strong and self-assertive as they are and as capable of defending their own interests. They may even feel manipulated and exploited by people who need too much from them” (211).
“ENTPs are easily bored, and their attention span can be ruthlessly short. Unless they are discovering something new, pursuing a hunch, or acquiring another angle on a persistent question, they are likely to be restless and agitated” (211).
“On the other hand, the type's disinterest in hierarchy and displays of status can result in a disarmingly direct and unpretentious style of relating. A shipping clerk who had been talking to a famous ENTP scientist in the hall of a major research center was amazed to find out who his conversational partner had been. ‘He didn't talk like he was important; he seemed like the kind of guy you'd go bowling with’” (211).
“This is one reason such types often have broad public influence. They combine a grassroots appeal with a highly systemic view of reality. For example, ENTP politicians generally outline ‘wholistic' plans that paradoxically promise more localized control” (211).
“The full maturation of an ENTP usually depends on the type's willingness to use Introverted Thinking for perspective on—as well as support for—the aims of f dominant Intuition. All Extraverted Perceivers emphasize the value of personal freedom, and ENTPs are inclined to draw from their tertiary function, Extraverted Feeling, to disarm people before they're able to exert control” (211).
“When they learn to apply Introverted Thinking to their own behaviors, they being to work their will on the inner rather than the outer world. They develop more self-discipline, and they recognize their responsibility to others in the larger scheme of things. ENTPs who manage to do this are natural leaders, humanitarians, whose efforts may extend beyond their own lifetime to change the way we understand reality” (211).
“In this respect, well-developed ENTPs are like mature ESTPs. They have an effect on us, and we regard them as larger than life. ENTPs, however, are a different sort of hero. One might consider the difference between an ESTP Olympic athlete, who represents American ideals of mastery and discipline, and Steve Jobs, a probable ENTP, whose ideas for marketing the personal computer changed the way Americans understand everyday life” (212).
“Extraverted Sensates embody, in their actions and personhood, a way of being that we admire and want to imitate. Extraverted Intuitives foreshadow a new way of looking at things—a paradigm that reveals unsuspected connections and permits us to see the world differently” (212).
“ENTPs tend to be high-scoring Extraverts who want to exert an external effect on a grand scale. They have real vitality, enjoy life, like to laugh, and relish socialization that involves a freewheeling exchange of views and ideas. Like all Intuitives, they can be playful, but their sense of play is generally confrontational, and they may have a tendency to ‘test’ people with a barrage of puns or bantering remarks” (212)
“Because they depend on being challenged to stay interested, they’re likely to challenge others, and they enjoy being one up on almost anything that interests them—even if it’s just knowing the latest gossip about mutual friends. Accordingly, they may not realize that others can be exhausted by their relentless pursuit of reactions and contest” (212).
“In fact, the thrill of being tested beyond their own resources is so pleasurable to ENTPs that they may take unnecessary chances simply for the opportunity to improvise and beat the odds. Sometimes this involves physical risk, particularly if the enterprise also involves the promise of discovery: deep-sea diving, white-water rafting. For the most part, however, ENTPs take chances by being mavericks. They will abandon a successful career for something unknown, challenge an authority, antagonize supporters, or try to get away with something just because they can” (212).
“Inevitably, they make some enemies. This happens, in part, because they enjoy a good skirmish. But they can be puzzled and irritated by people’s expectations of them, especially if circumstances have dictated a change of heart or mind. They may even regard a person’s anger or disappointment as a tactical maneuver that they need to counter or escape from. Like all ENPs, they will anticipate disaster or entrapment on the basis of one or two negative cues” (213).
“Because they depend so much on their dominant function, ENTPs may be somewhat deficient in the Feeling and Sensate aspects of life. This may not be apparent right away, because ENTPs can relate with great charm in the pursuit of a goal that interests them. Moreover, their expansive nature and appetite for life can make them seem more Sensate than they really are” (213).
“ENTPs can easily forget about their physical needs. They can get so caught up in a project or idea that they will work until they get run down and sick. They may forget to eat or subsist on junk food because it's quick and easy and gets them back to the drawing board right away. They need to pay attention to signals of fatigue and stress-related illness” (213).
“Introverted Sensation is the ENTP's inferior function, and the type's behaviors generally bear this out. Introverted Sensation encourages the maintenance of consistent inner priorities. ENTPs want the freedom to change their direction at any given moment. They find rules and regulations frustrating and confining--an affront to their individuality--and they have a tendency to flout them simply to prove their point” (213).
“It's a rare ENTP who hasn't thrown out the baby with the bath-water somewhere along the line. Extreme types can seem downright hypomanic—unable to contain their own energy, intolerant, impulsive, full of passionate conviction, certain that ordinary rules don't apply to their own behaviors” (213).
“These types often choose mates who can provide them with stable reference points and are willing to take responsibility for the maintenance of social relationships and the day-to-day chores of life. They tend, however, to regard these things as touchstones. They want the freedom to use them and disregard them as desired” (214).
“ENTPs need to turn deliberately to their secondary function in order to realize their full potential. Introverted Thinking gives ENTPs a sense of the ties that bind in the complex weave of life relationships. It tempers the type's need to resist control by taking it or disarming others. Instead, ENTPs recognize their responsibility to the situations they've created and to the people who care about them” (214).
“A self-disciplined ENTP is extremely attractive to others, because people sense the kind of power that has been harnessed to the task. Once Introverted Thinking is helping to balance Extraverted Intuition, ENTPs begin to draw from their less-developed functions more consciously—to recognize the value of others beyond their immediate utility and to stick with something until it is fully realized” (214).