DS Endeavour Morse
- Adorkable: His enthusiasm of opera and slightly awkward demeanour can be quite endearing.
- Bookworm: What could one expect of someone, who went to Oxford?
- Break the Cutie: As this series takes place before Morse was his older and more cynical self, we see the events that made him so.
- Embarrassing First Name: Thursday calls him by his first name in the pilot episode, grabbing his attention. Not many others seem to know, most likely because he keeps it under wraps.
- Encyclopaedic Knowledge: He seems to know something about everything. A particular and satisfying example is when he calmly wipes the floor with a college professor in "Trove".
- The Dulcinea Effect: There is a pretty girl around? You bet Morse already feels protective of her.
- Drowning My Sorrows: After being introduced to alcohol, Morse has developed an unlucky tendency to hit the booze sometimes.
- Enraged by Idiocy: Morse will not stand for shoddy policework, something easily observed during season 5.
- No Social Skills: At many times, Morse has an unlucky tendency to not being able to recognise when it would be wiser to say nothing at all.
- Sugar-and-Ice Personality: While Morse comes off as being rude at times, to most he stays pretty civil and some (mainly his girlfriends and the Thursdays) see his warmer side.
- The One That Got Away: It is implied that Morse still fancied his ex-fiancée during the first season. He gets better, though.
- Undying Loyalty: Has this sentiment towards Thursday. Especially visible during the finale of season 3, where he very willingly remains in danger to help out.
DI Fred Thursday
- A Father to His Men: Treats his colleagues with respect and maintains a mentor-like role.
- Berserk Button: Hurting his family is a generally bad idea.
- Determinator: If Fred Thursday sets out to do something, it will be done. Even if it includes bank robbers, corrupt police officers or gangsters.
- Old-Fashioned Copper: While he stays on the right side of the law, he is not afraid to sometimes use a little force when handling criminals. This can at times clash with Morse's by-the-book methods.
- Papa Wolf: Thursday is almost violently protective of his family. His paternal instincts even extent to Morse as well.
- Reasonable Authority Figure: He is willing to listen to Morse's ideas, something
DS Jim Strange
- Beware the Nice Ones: Strange is quite a nice guy, however, plenty of criminals have seen the tougher side of him.
- Real Men Cook: Turns out during season 5, he is a pretty good chef.
- Social Climber: Forges masonic relations that helps him advance in the hierarchy. It is not exactly portrayed as positive.