Alternate Character Interpretation: Nina Wang: Girl who always did her best only to get manipulated by Nagi and Sergay, tragic figure who has good intentions but started down a dark road due to a few critical mistakes, or completely and utterly amoral individual who is willing to commit mass murder for the sake of her incestuous love for Sergay?
Big-Lipped Alligator Moment: Shiho's dream sequence in episode 21. Made even more disconcerting by the fact it pops up in an otherwise tragic episode.
Die for Our Ship: Mahya. This is more understandable than many examples, as she deliberately interferes with Akane and Kazuya's attempts to have sex (instead of merely being someone either one could be or is interested in), but she still gets a lot of hate for interfering with the couple.
Draco in Leather Pants: Nina. Despite her detractors, she still has fans willing to overlook or excuse her actions in later episodes.
Ensemble Dark Horse: Erstin's unexpected popularity among fans of the anime led to her surviving in the manga continuity, and actually being a member of the main Power Trio.
Fanon Discontinuity: Those who take the series seriously tend to ignore what little "plot" there is in Mai-Otome Zwei as much as possible, and advise others to do the same.
Idiot Plot: This entire series when you look at it. Seriously whoever thought it was a good idea to have a Body Guard who if killed it kills the person they were guarding? Not to mention not once is the idea to have the handler be a person on death row or a low level soldier. Nope it is always the one in charge. Excellent idea indeed.
Jerkass Woobie: Mimi is not the most pleasant individual, especially considering that she's willing to let Aoi die for her loyalty to the queen], but her backstory (her father losing his job, becoming an alcoholic and dying) and her own eventual death are quite tragic.
Arika and Mashiro have a bunch of moments together in the later episodes that border on romance scenes where they encourage each other to keep going.
Erstin with Arika and Nina, particularly Nina. In one scene in the pool, when a water monster slithers by her, she assumes Nina is feeling her up, but bashfully tells her that If It's You, It's Okay. She also sends Nina and Arika a letter saying that eve though she was told not to make any friends at the school because she was a Schwarz infiltrator, she still found herself becoming close to them.
Aoi and Chie. When Nao asks why Chie was in town the same night she captured some thugs who were attempting to rape Arika, Chie jokingly replies that she had "a date." After Aoi almost dies performing her Heroic Sacrifice for Mashiro, Chie visits her in in the room where she is being treated, and is overjoyed when she regains consciousness.
Usually happens when Erstin or Natsuki is involved.
Moral Event Horizon: For Nagi, the point where he shoots Sergey and then ties him to the Harmonium, and then forces Nina to run it to keep him alive. For Tomoe, her organization of the Attempted Rape scenario, which thankfully failed.
Though still not an altogether nice person, Juliet Nao Zhang is a far more decent human being than her Mai-HiME counterpart.
Popular as she is, Shizuru's actions in Mai-HiME didn't sit well with some people. Mai-Otome's Shizuru is considered a lot cooler.
Saved by the Fans: The popularity of Nao and Shizuru's "Earth" incarnations prompted their return as heroes in this second season.
Unpopular Popular Character: Shiho is considerably better liked by the fans than her HiME counterpart, but its revealed in the sound dramas that she is by far the least popular Otome among those that Backstage sells merchandise for, especially after her fairly humiliating outcome from the incident in the pool (which was mostly her fault).
Viewer Gender Confusion: Gal is female, but given that she's a Cyborg and her voice is distorted, it's hard to tell.
The Woobie: Erstin. She was becoming friends with Arika and Nina despite trying to avoid becoming attached to anyone at the academy, but knew the "black letter" from Schwarz would come one day and she would become their enemy.
Evil Is Sexy: In the manga, Fumi, after being turned and Dark Hime!Yukariko.
Idiot Plot: The Arashi plot can basically be summarized as "Garderobe is bought by a crooked noble and the Otome turned into Go Go dancers, but no one seems to think that the most powerful institute in the world needs to be rescued." Yeah.
Gets even worse near the end, when we are forcibly reminded that many of the Otome have some very wealthy, powerful relatives (They are eventually saved by Natsuki's mother. You know, the one who owns a country?!) who could have resolved the entire situation in ten minutes, yet nobody ever asked them for help.
Natsuki argues that Garderobe, an international organization, can't have deep ties with a single country, but her mother disagrees.
This goes double for the Super-H extra which came with Arashi, which basically boiled down to justification for fanservice.
Moral Event Horizon: Most of Sergay's actions after his being revealed as evil qualify, including killing Mashiro when she is no longer useful, trying to destroy the world and almost killing Manshiro.