Marvel universes and he's only going to continue to be a popular, versatile actor.
While Tennant himself is more of an INTJ, "The Architect" who knew he wanted to act as a toddler and used his hard work and confidence to pursue that career, his roles definitely vary more widely.
The Tenth Doctor: ENFP The Campaigner
Even though Tennant is an introvert, he is fantastic at playing the extrovert, particularly when that character has a personality larger than life. A prime example is the Tenth Doctor of Doctor Who fame, who is excited by big ideas and needs to connect with people more than anything else.
The Tenth Doctor is one of the most energetic of the Doctors, as well as one of the most friendly versions of the character. Charming and intuitive, "The Campaigner" is great at communication and solving problems with his people skills in ways other Doctors have struggled with, even if he does over-think some things in his wibbly wobbly timey wimey world.
Crowley: ENTP The Debater
As "The Debater," or an ENTP, Good Omens' Crowley is a deep thinker who thinks of the long-term effects of the Armageddon. He's not one to simply follow the rest of the demons into an epic end-of-the-world battle, instead opting to question everything and argue against the status quo. He's a planner who is all about the big picture, and he stays one step ahead of the other demons as a result.
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Charismatic and full of energy, Crowley doesn't have a hard time convincing Aziraphale to follow his plan, largely because it benefits them both but also because he combines his knowledge with his original ideas, making him a keen debater.
Alec Hardy: INTJ The Architect
If there was ever an introverted character that David Tennant played, it was Alec Hardy, the brooding detective of Broadchurch fame. It's no wonder the character wants some alone time after all he's been through, but he's also an INTJ, "The Architect," and like Tennant himself, he has a grand plan, which we discover in the second season of the show.
Hardy has a quick intellect, and he's one of the most decisive characters in the show. Some of this comes from being an outsider but it's also due to his confidence and independent nature. Like many architects, he doesn't care if he has to step on a few toes, even those of authority figures, if it means implementing his own ideas and plans, which are often better.
Benedick: ENTP The Debater
Witty and full of imagination, Much Ado About Nothing's Benderick might at first appear to be an ESFP due to his need to perform, but his desire to pick apart the logic of others just for the fun of it makes him a classic ENTP, "The Debater." He doesn't succumb to love but instead chooses to pursue Beatrice, and even then analyzes every little detail the way a Debater does.
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While he's an optimist, he is also prone to make extreme exaggerations to benefit his own views, particularly when it means winning an argument. His competitive nature drives his need to debate everyone, whether it's in matters of logic or love.
Campbell Bain: ENFJ The Protagonist
David Tennant was practically a baby when he played Campbell Bain, a manic-depressive young man on the BBC Scotland show, Takin' Over the Asylum. Extroverted and enthusiastic, he tries to show DJ Eddie the ropes when he first comes to the asylum, and he's so charismatic that Eddie mistakes him as an orderly rather than a patient.
Campbell is a natural born leader who thinks he'll be able to make it to the big time with Eddie, and he wears his "Loony" badge with pride, demonstrating the kind of ion that an ENFJ, or "The Protagonist," is known to have. He's even tolerant of his own hate mail, as an ENFJ might be.
Richard II: INTP The Logician
In Shakespeare's play Richard II, David Tenant played a highly flawed king who eventually meets his end. As an INTP, "The Logician," Richard II is an analytical thinker who attempts to make good decisions for his people at first, but he's so absent-minded in his rulings that they appear to be arbitrary and unfair. He is insensitive to the needs of others at times, dismissive of their objections and changing his mind in the middle of his actions, such as during the duel between Thomas Mowbray and Henry Bolingbroke.
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When Richard fails to explain his weird rulings and banishment sentences, he only appears condescending to his people, and he second guesses his original judgments, making him one of the worst versions of this MBTI personality.
Jean-Francios Mercier: ISTP The Virtuoso
In the dramatic BBC miniseries Spies of Warsaw, David Tennant portrayed spy Jean-Francois Mercier, an ISTP, or "The Virtuoso." The military attaché may be a member of the aristocracy, but he's also a military man, making him a jack of all trades. He's logical and rational, and he acknowledges that war is coming. According to Tennant, Mercier was motivated by both his own morality but also by a sense of duty, which made him good to have in a crisis like the war, as many Virtuosos are.
Mercier knows to prioritize Hitler as a threat, unlike many people in the early years, and he's known to be stubborn as well as to engage in risky behavior, even if it did benefit many people.
Hamlet: INTP
Has there ever been a more withdrawn Shakespearean protagonist than Hamlet? While the answer might be a grudging yes, this INTP, "The Logician," is whom many bibliophiles picture when they think of the word "depression." He's analytical to the core, which often hinders him as he attempts to make decisions about what to do against his uncle's betrayal.
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Hamlet is a very private person, and quite insensitive to the needs of the people closest to him as he pursues his quest for a logical solution. He constantly second guesses himself, often thinking about a better solution instead of acting on the one he's already decided upon, leaving himself in a state of limbo until his tragic end.
Kilgrave: ESFP The Entertainer
Possibly the most nefarious villain of the Jessica Jones' captor and arch enemy Kilgrave, is an extroverted ESFP, "The Entertainer." Everything is a show to him, a constant opportunity to manipulate others into his idea of what reality should be. He uses his powers of observation along with his mind control abilities to create short-term plans that mostly only benefit himself.
Unlike many other MCU villains, hedonistic Kilgrave is all about what benefits him today, not the big picture. Conniving and cruel, Kilgrave grows bored easily and uses his abilities to entertain himself most of all, even at the expense of the lives of others.
Barty Crouch, Jr: ENTP The Debater
Questioning authority, arguing against convention and being as argumentative as it gets with the people in his life, Barty Crouch, Jr. is an ENTP, "The Debater." His service to Voldemort in Harry Potter and the Goblet of Fire should not be confused with subservience, as he's all about his own choices and rejecting the traditional way of thought, including conventional solutions to problems.
Like Voldemort and his Death Eaters, Barty is intolerant of those who don't believe what he does. He thrives on originality, making his year as Mad-Eye Moody the perfect chance for him to prove that he's smarter and more cunning than any of Voldemort's cronies. After all, who else was able to hide right under Dumbledore's nose? (Several people, as it turns out.)
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