Some people say Dexter is 6w5 or 3w4 or 1w9.
I just watched Season 4 of Dexter (Be warned: SPOILERS AHEAD), and this after learning about the Enneagram. (I watched the previous seasons before learning about it) I've got to know my type very well over the last months, and while watching Dexter S04E01 I got an epiffany & realized that Dexter was just like me, a 1w9. I will try explain why, and also why he is not 6w5 or 3w4. This might a bit biased, since I'm 1w9. I could argue even that there is a 2wing hidden in him as well. (sounds wierd for a psychokiller) I could go on writing a lot more with these observations of Dexter I've had. Please correct me if I'm mistaken.
He is 1, because if this:
Perfectionsm: His clean kills, everything has to be perfect & his perfect cleaning up.
(3s are also known for their perfectionism, but for totally different reasons)
He clearly tries everything to avoid failing. He aborts kills if it is to risky, he relocates them to a totally secure location. He is clearly driven by the fear of not failing, (which seems like a 6, but is not) note that law no1 in Dexter's code is "Do not get caught" aka "Do not fail"
1s are driven by what is right and wrong. And this is clearly shown his moral code. Dexters criminal record is clean (on paper) and is only broken for the greater good. Dexter shows the right and wrong in his target pickings, and in season 4, he spares Lumans life, because it is not right to kill her. This moral code, is normally shown from an inner critic voice. This is Harry.
There is a big difference between him and his fellow psycho killers. Some say Dexter is artistic (the 4 in 3w4), though he clearly isnt compared to his fellow guys. Rather the Art of Skill and perfection is an very exitment to a 1. Dexter never focuses on the Art side, always the perfection and what is right. Also note that his throphys, aren't shown (like the urn or the barrels or the drained up bodies) but hidden, and only a drop of blod, for the reminder of the rightful kill of an guilty man. This is why he is not a 3w4 because he is not driven by the goal to be the best, or show the best artwork like many of his fellow psycho killers. If he would, he would show it to the world (though he is a cop), rather he hides it deep in the sea, so that no one would ever find out. 1s don't like the spotlight very much, and the sign that he is a 1w9 is that he always tries to slip away from the spotlight. Also, if he was a 3, he would try climb the ranks, in some way. To achieve more, this however, is not the case in Dexter. He doesn't need anything more. The world doesn't attract him.
Dexter sees very fast if something isn't right, if something is off, at every crime scene. He also sees when something is perfectly done, that intrigues him. This is where his detective skills come handy. 1s are great thinkers, but they decide out of gut feeling, not head. This is why so many times they takes decisions that might be wrong. A 6 or a 5 wouldn't dare to act until they are sure. This is why the code keeps him at bay here, because he has derailed several times.
1w9 is also called idealist. His main goal the optimal or the best way. This is his main priority. Because so many killers get on the loose, he sees that the court system is flawed, therefore acting and working hard to achieve the righteous judgement, not to mention the most ideal way, to see them pay for their crimes by death (according to his moral standards).
1w9 tend to procrastinate the things that are 2nd on their priorities, his family & relationships. Dexter also has an ideal way of all relationship, therefore the wife, kids, car, house, everything typical normal idealistic harmony. It is his best cover also. He is also trying to look for the ideal woman, and always tries to find someone who might understand his inner darkness. In season 2, he almost found that in Lila, though it wasnt good enough, though he got his hopes up. Rita was just the ideal cover (sorry guys) though good enough for the cover and we always see him discussing with himself, Rita. He is concerned that if she finds out what monster he is, he will destroy her. He is simply afraid of leaving her, because of the family, I believe that Dexter really never loved Rita. He got simply blowned off that his cover got blown and his ideal life shed to pieces. I also admires Trinitys ideal ways first (gut) then finds out that it isnt as ideal. He finally meets someone (Lumen), who he understands, and gets totally shattered in the end when she turns him down, because finally, het let someone who knew a part of him, inner darkness, and accepted him. This is typical 1 as well, because they are afraid of leting people see who they really are. They are afraid of being hurt, afraid of failing at relationships. And in the end, he says that he accepts it and will carry that for her, that burden, "the dark passanger". This is also one of the clearest traits that Dexter is a 1. Because they are carrying the burdens of others, the burdens of the world, to the end of depression. They have a hard time finding it to be happy, they can feel very sad. Time to time we see Deb tell him to cheer up. That is typical to find in a 1w9. Also, very rarly we accept that "this was a perfect kill" or "this was the best way" rather, we aknowledge our almost mistakes, or the flawed ways that might have gone wrong. He also is very strict with himself, and when things gets out of hand, he blames HIMSELF, and only himself.
Dexter can be easy to deceive, this might be his greatest weakness. (we see this in the case of his brother (who truly understood him) in the case of Trinity. He believes what people tell him or what he sees (if he doens't know better) So many things I could point to here. He is an excellent teacher, to both his students. He is a good "Father" when he is around. All these are typical 1 traits.
We see also more the 9 side of him, when he doesnt know how to face the world as a suspect of the FBI. He runs at first, this is a clear sign of the 9, then he decides to do the right thing. This is why he is a 1w9. The 1 wins in the end. the 9 we se also in his relationships, they need good with everyone. He isn't the first to show hard feelings towards people, except if they've done something wrong. If something is off with someone (like with his stepdaugther) he isn't at ease with it until its settled.
He also over and over again shows his Gut feeling. In the beginning of season 4 we see a very sloppy Dexter. He isn't thinking, but acting on his gut feeling, going for it, not because of feelings (hate, thirst, etc) and not because he has somehow had a well thought out (flawed) method, but because of the impulse his Gut saying that this guy is the killer, and go for it, he believes it very fast that he is right, before he regrets his mistakes, because of his gut. He also, never hates anyone, rather he dislikes them, and has an "off" gut feeling about them. (Quinn, Doakes) Though he doenst show it with "hating" them or confront them (rather avoiding them, because of the 9) and trying not to blow his cover and rather keep an ok relationship with them.
His thirst for blood, is his way of feeding himself, his ego. 1s have our ways to dig ourself in when we are either depressed (we procrastinate the problem and go, in this case kill) and in some cases, we lose control.
Dexter is also clearly has a more of an anger issue rather than shame or fear. This clearly puts him in the 8-9-1 section. His anger bursts when there is stuff he cant fix, or get right. (eg. ritas death (killed that dude in the bathroom for no reason), lumens rejection (throwed the plate at the oven)) These things are shown countless of times.
Dexter is, CLEARLY in my opinion, without doubt, a 1w9.
PS. I am aware of my 1 bursting out here, though this might be the wrong forum to ask. But does this make any sense? Could he be any of the other types? And why?