Charlie Hudson’s MBTI type has become a frequent discussion among fans of Hudson & Rex. In the series, portrayed by John Reardon, Charlie shows the decisive leadership, procedural focus, and investigative efficiency typical of an ESTJ, while his principled, justice-driven mindset aligns closely with Enneagram 1w9. His commanding presence in the field, evidence-driven interrogations, and calm authority under pressure make him a powerful example of an ESTJ 1w9 character in modern crime television.
ESTJ 1w9 Characters
Why is Charlie Hudson from Hudson & Rex an ESTJ? Continue reading to find out (and as a bonus, at the bottom of the page, I’ve typed Rex!). The headers for each section are clickable, so you can easily access more information about the dominant function and the Enneagram type, or discover more characters who share the type.
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Extraverted Thinking
Charlie can keep his emotions in check and focus on the job even under duress; in one episode, his beloved police dog and partner, Rex, is taken away from him, and it’s unsure whether he will get him back. Instead of falling apart, Charlie focuses on solving the case and clearing Rex’s name without becoming emotionally compromised.
In all episodes, he pushes forward his investigations, takes a directive approach in the field (negotiates tasks, collects evidence, and organizes the crime scene), and handles most of the interrogations. He is straightforward in how he questions people, demanding they establish the facts (where they were, what motives might incriminate them, how they can explain their actions) and then ruling them out based on the evidence. Sometimes, Charlie will play the “bad cop” and be aggressive toward them, to intimidate them and get them to admit to something underhanded, even if it doesn’t outline them as the murderer.
He is a workaholic, staying longer than his coworkers and taking instant charge of situations that go wrong (particularly when he and Rex are threatened, kidnapped, or shot at); his take-charge behaviors are visible in how he handles Rex—with constant training and refinement of his skills, and by directing him with specific commands (“Go get him, Rex!”; “Track it”).
Introverted Sensing
Rather than rely on gut instinct, Charlie wants to build a solid case and to follow the clues wherever they lead. He examines crime scenes methodically and notes minor details, which he later brings up in examination rooms. He relies on Sarah, the medical examiner and later his girlfriend, to help him piece together the evidence into a decent case, and he waits to theorize about what happened until he has a better understanding of the people involved and of the crime scenes.
Charlie both respects procedure and tries to abide by it in closing his cases, and disregards it when he sees a way he could push things into an escalation to reveal someone’s motives.
In his personal life, he loves to tinker with practical things; he builds a motorcycle in his spare time, and he likes to fix his car. He winds up in a domestic lifestyle with Sarah, in which Charlie is always cooking for her (and he’s good at it). He carries around bad blood toward his brother and resentment toward his father, who shows up in one episode to impede his investigation. Charlie can’t help dwelling on the past and on their rocky relationship while he solves the case, and has to point out to his father that they are different people with different demands now.
Extroverted Intuition
Charlie moves from one theory of who is behind the murder to the next as he follows the evidence. He may think at first that a musician killed their teacher, then shift his attention to their stepfather, only to later conclude that it was the assistant at the music recording studio to cover up an embezzlement. He follows the trail of facts (Te) to wherever it leads him (Ne) and rarely gets stuck on one interpretation of the events; he has other theories waiting in the wings.
In his personal life, Charlie has several interests he keeps up with, and he knows a lot about different things, but he has a rather bemused attitude toward Jesse (an ENTP) and his constant Ne-driven activities and brainstorming sessions. Charlie likes to sit around his office with his coworkers and talk theoretically about what could have happened and who could be responsible.
Introverted Feeling
In several episodes, people or animals Charlie knows and cares about are in trouble, but he remains calm and collected on the outside and never once breaks down in the presence of anyone else. He says that Rex would want him to stay on top of things. In another episode, Charlie is buried underground in a coffin, and where someone else might fall apart, he stays quiet and collected. Never has he cried on the show, or broken down in front of his coworkers; Sarah often asks if he is all right, and he will say, “No, but I have to keep going,” or a variation of it. He has self-contained emotions, and they don’t leak out of him to impede his investigations (an inferior Fi trait).
The Enneagram 1
Charlie is duty-driven and principled. He has a strong sense of right and wrong in both how to conduct his professional life and in how to close his cases; he doesn’t take shortcuts or cut criminals any slack, and several times, has told people they deserve to be behind bars because of their reprehensible behavior. When situations get bad, Charlie stays in control of his emotions and competently figures out what to do next.
He winds up dating Sarah, and while it’s not anti-company policy, he also keeps it a secret for a long time. It’s unclear whether he wants it just to be their thing, or if he doesn’t want to appear in other’s eyes to be doing anything “wrong.” But he wants it, so he doesn’t question it for himself (the certainty of a 1 knowing and thinking that what they want and feel is what is appropriate). Charlie doesn’t love conflict, but he stands up to people easily and criticizes their behavior; he gets mad at his father, a naval general, for blocking their investigation by denying them access to one of his midshipmen, which gets Hudson Sr. to relent.
The 9 Wing
He has an supernatural level of “calm” even in intense situations; he calmly takes charge, directs people, negotiates with gunmen and terrorists, and then reaches the end of his rope and sends Rex to knock them down or take their guns. Even when Rex is no longer at his side and he’s not sure if he will ever get his partner back, Charlie doesn’t lose his sense of calm detachment. When Sarah asks what he is feeling and if he needs a break, he shakes his head and admits that he’s upset, but he’s unable to show it.
He tries to diffuse problems before they escalate and to keep his suspects calm, except when he wants them to get agitated in case they slip up and reveal too much. In one episode, he goes undercover in a prison, a high-risk situation, and when others try to shank him, he plays the role of a “mob boss” convincingly by grabbing a man by the arm, twisting it around behind his back, and quietly saying that if he tries something like that again, Charlie will break it the next time.
Why Charlie Hudson Isn’t an ISTJ
(ESTJ vs ISTJ)
Some viewers might interpret Charlie Hudson as an ISTJ because he is dependable, professional, and strongly committed to his work as a detective. However, a closer look at his personality and behavior throughout the series suggests he fits ESTJ much better than ISTJ.
First, ISTJs show a more reserved and inward-focused demeanor, preferring to work quietly and independently. Charlie is noticeably outgoing and socially engaged. He regularly leads conversations during investigations, builds rapport with witnesses and suspects, and naturally takes charge in group situations. His confidence in interacting with people reflects the outward energy associated with Extraversion, which points more strongly toward ESTJ.
Second, Charlie often assumes a leadership role within his team. While ISTJs value responsibility and duty, they focus on completing tasks reliably rather than directing others. Charlie frequently coordinates investigations, guides discussions, and asserts clear direction when solving cases. This kind of decisive, outward leadership aligns closely with the Extraverted Thinking (Te) dominance seen in ESTJs.
Third, Charlie is comfortable thinking out loud and working through problems collaboratively. ISTJs prefer processing information internally before presenting conclusions. Charlie verbalizes his reasoning, bouncing ideas off colleagues and using discussion as part of the investigative process. This outward problem-solving style is characteristic of an extraverted thinker.
Finally, his dynamic partnership with Rex highlights his proactive and action-oriented personality. Charlie drives investigations forward energetically and engages with the world around him rather than quietly analyzing from the sidelines.
Rex’s Personality Type (ESTP)
I love typing animals because it’s fun! (And they absolutely do have distinct personalities!)
Rex, Charlie Hudson’s loyal canine partner, is an ESTP. He is present-focused and action-oriented, responding quickly to changes in his environment and eagerly engaging with the physical world. Whether tracking suspects, chasing clues, climbing through heating vents, charging into burning buildings, attacking people who pull a gun or a knife, or running after a van, Rex thrives on immediate sensory information and decisive action (Extraverted Sensing). Rex is highly confident and fearless in high-pressure situations. ESTPs are known for their boldness and willingness to jump into action when others hesitate. Rex frequently runs toward danger during investigations and shows remarkable courage when protecting Hudson or helping stop criminals.
He is a problem-solving dog, who doesn’t wait for his master to tell him what to do, but figures things out for himself. He figures out ways to reach suspects, locate hidden evidence, or alert Hudson to important clues on the spot. Rex will chew through a rope that has him tied to a fence, sneak through a hole in the fence, or figure out how to open a lock (Introverted Thinking).
Rex is extremely likable and a sweet dog; he watches people for physical clues about what they are feeling and shows them sympathy and comfort, by going up to them, resting his hand or paw on their knee, or allowing them to stroke him to calm down. It’s a nice visual representation of Extraverted Feeling in an animal, sensing when others are suffering and going to comfort them.
Sometimes Rex has a hunch about a situation and whines to alert Charlie to something being wrong about a person or a situation ahead of the danger that is coming; that’s how he shows a bit of Introverted Intuition.
If Rex had an Enneagram type (I think animals do) it might be a 3w2. He loves to be the center of attention and tackles challenges head-on, confident that he can do it. He easily adapts to whatever the situation asks of him, and is a warm, friendly, likable dog with a sweet temperament. He is forever charming people into giving him pets and treats, and is there for them when they are emotional. In the one case where he had to stay behind in Charlie’s apartment rather than be on duty, he tore the place apart and broke things because he was so bored and unfulfilled without a job to do.
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