These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ho Yay: All the boys have this to a certain degree, but Kazuma and Shiranui may well be the worst for it.
Uncanny Valley: Gessho Kuki. Seriously. Between the pupilless eyes, obsession with fate, lack of human emotional reactions, and utter calm with which he issues his orders there's just something off about that man. It's completely deliberate of course, especially given the revelation that he isn't human. Then again, Rikimaru and Ranmaru apparently aren't either and still manage to seem a lot more human than Gessho does.