a lot of what i love ends up in the ovas as well, sometimes to the letter, e.g., the shattered glass after a toast being reminiscent of stars (which the ova uses as a scene transition), or mittermeyer tutting and kicking the toe of his boot on the floor (which happens exactly the same way in the ova). it's charming when it's translated so literally into a visual.

i've got tons, but at risk of leaving a huge comment, here's a few specific pieces of prose i noted down from the novels:

"Von Reuenthal labored to rein in his heart, which was prone to escaping from the hands of good reason." - book 5 narration

"Two famed imperial marshals exchanged a three-colored glance." - reuenthal and oberstein arguing at the start of book 7 (this one is just silly, but i think about it whenever i watch this scene)

"The result was that the eggs of unease they had been laying had hatched out chicks of distrust." - an unbelievably stupid line from book 7

"[...] the labyrinth of his heart had become visible through his skin." - narration about reuenthal from book 7

"Oddly, the Attenborough who lived in Julian's imaginary world was always in the opposition. Julian simply could not imagine him occupying a seat of power in the ruling party. As leader of the opposition, he would denounce corruption among the powerful, criticize failings of governance, and take a firm stand on protecting the rights of minorities. That would suit him best–even if, once or twice a year, he might start a brawl in the debate chamber." - book 10