Title: Ser Gruff Lawkin, Shariff of the Capital and Constable of Castle Royal
Actor: Hugh Laurie

Concept

Snarky Detective & Judge

Tropes

Oversees district bailiffs, handles felony/royal cases
+Sergeant-at-Mace
Beknighted some time ago by His Majesty for his prior law-enforcement successes (as constable?)
Primary: His (family) business is in deep financial trouble, and he's been procrastinating against making a hard call to deal with it.
Secondary: The City Fathers are resisting his attempts to get them to pass jurisdiction-related edict(s) that would untie his hands so he can do his job more effectively.