Libary Assistant KoaNodaka is adorable. Not quite sure about Marisa-Haruna, and Fate-Mokou made me lol. Kaede as a Komachi is fitting as well. Natsuki-Ran nosebleeding over Kotarou-Chen is genius
Ryvian -> the thoughts behind Marisa/Haruna was that they're both straightforward bookworms and that they have a "close" relationship with Patchy/Yue. Well, that last one is arguable depending on the fan. xD