- Darkness-Induced Audience Apathy: When a show builds three episodes in a row around the defeated heroes being treated like crap and never getting a chance to strike back, you know you're in danger of this.
- Ensemble Dark Horse: Yun, Mamiina, and Rodoreamon have become the undisputed fan favourites, as has their subplot in general.
- "Funny Aneurysm" Moment: Angulas' refusal to say Aaeru's name when introduced to her was kind of amusing, right? Not so much when they reveal why...
- Genre Turning Point: What Yami to Boushi to Hon no Tabibito and Kannazuki no Miko did for popular acclaim of Yuri anime, Simoun did for critical acclaim.
- Hilarious in Hindsight: the concept of the world's civilization being entirely female is later joked by the fandoms on one of the Animes...
- Nightmare Fuel: In the second episode, after visiting the Spring for her gender assignment, one of the former Sibyllae of Chor Tempest leaves with this devastated look on her face. She starts to cry, and then collapses amid screaming tears. Since she still couldn't make up her mind after entering the spring, it chose for her.
- Some Anvils Need to Be Dropped: The anime's harsh criticism of the idea that Belief Makes You Stupid is unsubtle but poignant.
- Spiritual Licensee: It can be described as an anime version of A Canticle for Leibowitz. With added Les Yay.
- Subbing vs. Dubbing: Actually, more of a Subbing Versus Other Subbing. With a two year delay between its airing in Japan and its DVD release in North America (Although incredibly fast when compared to some other Anime) there was already a fansub circulating on-line (and a few episodes' worth of a second) before an official version was presented. None differ from the others in any significant ways, but neither can any agree on the proper ways to spell the characters names, and there are many different ways to "really" translate certain sentences.
YMMV / Simoun