You’re an excellent writer.Lindroos sounds like an interesting character.
I kind of wanted to work in just how controversial police forces actually were in the mid-19th century when they started to appear, when many elements of society, conservative, liberal, socialist, all tended to look at them with much scepticism, as akin to "So, the state now feels it proper to have an occupying army keep their own people in check?" (The Times once called for the abolition of the London Metropolitan Police for this very reason, actually.) And how furthermore, much of the early police force genuinely were made up of the same people who otherwise genuinely would be criminals since no other career prospects were on the horizon for people of their particular skills/lack of other skills.
My idea for Lindroos is that he is a "reverse rogue cop", a fellow who feels the need for a professional police that does its job properly, but that at the same time, he has empathy for the fact that most of civilized society has a very low view of police officers and the police as an institution. He's also meant to be a bit of a critique of the how pervasive the whole notion of judging by one's "gut feeling" is in most American procedural shows. Lindroos keeps himself cool and detached at all times, refuses to even have a gut feeling, going where the evidence leads, and not just cutting corners and going for the easy solution when it presents itself.
He's plainly and simply an honest man who wants to do his job properly.