Adding tittles like Dr or Detective/Sergeant/Lieutenant/Captain/Officer

John: My advice would be that if these characters already have a first name and a last name listed, leave the character names as they are and don't bother adding their titles. This is what the over-titling policy says: "Avoid extra embellishments/repetitions/nicknames unless they are part of the credited character name: it's enough to list Robert Patrick as John Doggett in the "X-Files" TV series, instead of "Special Agent Jonathan Jay 'John' Doggett"; Jeri Ryan played Seven of Nine on "Star Trek: Voyager", not "Seven of Nine, Tertiary Adjunct of Unimatrix 01, aka Annika Hansen"; Edward Norton played Will Graham in Red Dragon, not "William Graham" or "Special Agent Graham" or "FBI Special Agent William 'Will' Graham"; Matt LeBlanc plays Joey Tribbiani in "Friends", not "Joseph 'Joey' Francis Tribbiani". You get the idea." https://help.imdb.com/article/contribution/filmography-credits/characters/GKLQVXKH7U8DATWX# I realize that it might be desirable to some to have consistency, so that we don't have some characters on the same series with titles and others without (even if they have the same job as the characters with titles), but IMDb policy is that we don't actually need to have those additional titles provided.

@JohnConnor84: You state "an [sic] my OCD wants all the episodes to be the same". It's not relevant what you want or what I want. It's relevant what IMDb wants. IMDb wants to list characters the way they are listed in the credits. The first sentence of the guide that @gromit82 has linked to states in bold letters "Wherever possible, we list character names as they appear in on-screen credits, i.e. the end titles cast listing." I advise you to (re-)read those guidelines.