Ahh, but which POV do you mean? Writing from the point of view of Vimes, Angua et al. would mean that Terry's writing in
third-person POV (i.e. using pronouns like "he", "she" etc). Furthermore, the person named first within the scene is the only one whose head we can see into - so if we are first introduced to Vimes, say, then we can only see what Vimes sees, hear what he hears, feel what he feels, and are privy to what he thinks - and no-one else. It's as if Vimes has a little camera on his shoulder.
If we are privy to anyone else's feelings and thoughts, it becomes
omniscient POV, which is extremely difficult to do well without "head-hopping" - i.e. bouncing around between people's heads and never settling down, which is disconcerting and something that agents and publishers frown upon.
You can also write in
first-person POV (i.e. from the POV of the narrator). Conan Doyle did this all the time with his Sherlock Holmes stories, and Agatha Christie also did this many times from the POV of Captain Hastings). However, this is more difficult than third-person.
Least used, and hardest of all, is
second-person POV - where you try to persuade the reader that he/she feels something or does something because... ABC XYZ.

This is difficult to do well because each reader has different experiences and expectations, and would object that "I would NOT do [whatever]! I would NEVER do it!" etc. This is normally used in the "Choose Your Own Adventure" books, but nowhere else.
Here's a little more on different POVs:
https://www.helpingwritersbecomeauthors ... cient-pov/
Now, it seems to me that Pterry normally writes in third-person POV. For instance, in NW or Thud!, he definitely writes from the POV of Vimes: we are privy to Vimes's fears, theories of policing, feelings, thoughts, and pains. We see many other characters, true, but Vimes is definitely the central one.
In CJ, OTOH, I'm not sure that there are
any POVs - or, if there are, then we have more than one. Agnes Nitt is definitely the central POV, but we see quite a lot from Granny Weatherwax's POV, too.
I've probably been talking too much already, so I'll let someone else have a go...
