Johannes Cabal the Detective/YMMV


 * Belligerent Sexual Tension: Arguably, Leonie and Cabal. The two of them reluctantly respect and admire each other and when they're not contemplating killing or trying to have the other person arrested, they do make a pretty good team. There's also the fact that the two of them are forced to act as though they are besotted with each other in order to conceal Cabal's true identity, so in the eyes of nearly everyone on the Princess Hortense they are the Official Couple.
 * Also throw in the fact that Leonie Barrow is the in-universe Expy of the woman Cabal apparently became a necromancer for, and you can see why Cabal's feelings for Leonie are... conflicted.