It's time for the second TV Tropes Halloween Avatar Contest, theme: cute monsters! Details and voting
Anime Awesome Characters Heartwarming Main Manga TearJerker Trivia WMG YMMV
The Danza: Yuu Shimamura, the Class Representative, is voiced by Yu Shimamura in the anime. Her name wasn't revealed until chapter 49, which was published after the anime ended.
Hey, It's That Voice!:
Name's the Same: Her name is taken from another Kuesu Jinguuji from Palladium Garden, Matra's previous Hentai work. Also doubles as Expy since she's basically a Bleached Underpants version of said character.
No Export for You: The Light Novels, Book of the Gaiden, and the Yonkoma adaptation (only a section of it was put in Volume 0). The anime is a slight subversion since it is (legally) streamed by Crunchyroll.
Playing Against Type: Masami Kikuchi, known for voicing Nice Guy harem leads Keiichi and Tenchi, plays the Affably Evil Oni Shuten-douji. He actually does a good job in keeping the nice guy vibe while acting as an antagonist.
Portmanteau Series Nickname: OmaHima, which is even used by the author himself.
What Could Have Been: Word of God originally planned the series to end at the sixth volume. However, Executive Meddling forced him to extend it to twelve volumes.