#84 Yashima and Junichi, the abused Sekirei. Some theorize she may be Too Kinky to Torture, and was legitimately winged by her Ashikabi.
Legitimately winged or not, the ending shows that #84 was really not happy in that relationship. She meets Junichi again, and tells him to take a hike. Like a Real Life domestic abuser, he's very clingy, apologetic, entitled and does not take her rejection very well.
Mikogami is Obliviously Evil. He approaches the Sekirei Plan as a very exciting game, and concerns himself with things like following the rules and the best ways to keep things interesting, even if doing so puts him at a disadvantage. None of his actions violate the rules, and in fact his aggressive pursuit of new Sekirei for his collection is not only allowed, but actively endorsed by Minaka when he runs the "Green Girl" and "Final Feather" events. Furthermore, his interactions with his Sekirei and anger at the mistreatment of the East's Sekirei suggest he's a Benevolent Boss.
Anti-Climax Boss: The final battle in the Sekirei Plan between Musubi and Miya wasn't all that great. It was basically a OHKO due to the strength provided to Musubi that was offered from the rest of Minato's Sekirei.
Awesome Music: "Change the World", the insert song that plays during Musubi's battle with Karasuba in the 2nd season finale.
Base-Breaking Character: Kaho, the #87 Sekirei introduced late in the manga, has become this recently due to her Spotlight-Stealing Squad tendencies at the start of the 4th stage of the Sekirei Plan when she encounters Karasuba. Almost everyone believes that she is nothing but fodder to hype Karasuba's power to make her eventual fight against Musubi more meaningful, yet the manga still ends up spending a great deal of time developing Kaho's character at this point. While some like that Kaho is being developed, others wish for the manga to simply get her character out of the way already to move on to the more important plot-points of the story. Which does eventually happen as the way the fans guessed it would.
Crazy Is Cool: Minaka always had shades of this; his reason for creating and enforcing the Sekirei Plan is one part Science, one part Godhood and two parts for shits and giggles, but when he blows up his own building while still inside of it to make the game he was playing with Minato more interesting in the anime, he really does show his awesomely insane side.
Mikogami, since he's an obvious stumbling block for Akitsu joining Minato's harem. Discussions of his impending death, and Akitsu running off to join Minato's harem, occur literally almost every single chapter.
Ensemble Dark Horse: Tsukiumi tends to perform very well in popularity contests among fans of the series.
Fanfic Fuel: Many fanfics ponders the idea about exploring where the Sekirei came from and what their home planet was like to create a species such as them.
Fanon: A popular theory and Fandom-Specific Plot is that Akitsu will be winged by Minato, and join his harem. Often coupled with a hefty dose of Die for Our Ship. Ends up being Jossed, as she's eventually winged by Mikogami prior to overloading.
Fan-Preferred Couple: Minato x Akitsu is popular, with fans hoping that she would end up joining Minato's harem.
Fridge Brilliance: Mikogami's development was a source of Broken Base, but later chapters reveal the bond with a Sekirei can naturally change an Ashikabi for the better over time. This is driven home when Natsuo realizes that Minaka intentionally gave him Benitsubasa and Haihane in the hopes their bond would make him realize You Are Not Alone. It becomes even greater brilliance when one recalls the Japanese legend of the Wagtail that Yume repeatedly references — they are the birds that supposedly taught the Gods about love.
Game-Breaker: Karasuba states that Miya and Yume are both this.
Minato. 6 Sekirei, 5 of which are among the first ten - and thus stronger than the other Sekirei as a result of not having any inhibitors (namely numbers 2, 3, 6, 8/88 (Yume and Musubi share a body), 9, and 108.). Number 1, the strongest Sekirei, is his landlady and ally, and she's actually not part of the Sekirei Plan. In short, he not only has a large number of Sekirei, but more than half of the strongest ones are on his side.
Growing the Beard: The series started out primarily as fanservice and comedy, but has developed into a more serious, character-driven story over time. It still delivers on the fanservice, but has a stronger focus on plot and characterization. This began with the Bridge Escape story arc, and has continued since then.
Minato and Homura, complicated somewhat by Homura's Gender Bender situation. Homura frequently blushes around Minato, and blames Tsukiumi for "infecting" him.
Mikogami and Mutsu. In an omake, Mikogami expresses an interest in seeing what would happen if he kissed Mutsu down there.
Uzume and Chiho, who state their love for one another repeatedly.
Uzume and Kazehana
Musubi enjoys groping Tsukiumi, stating it makes her "feel good".
Yukari gropes Musubi when they first meet, and later expresses the desire to do so again.
Matsu with pretty much everyone.
Karasuba, who aggressively pins Musubi to a wall and commands her to get stronger, with the handle of her sword poking Musubi in a very suggestive fashion. It's also implied that Yume is The Lost Lenore, in a very disturbing kind of way.
Mikogami Hayato, revealed to be a Lonely Rich Kid with a serious case of Parental Abandonment. Higa's Sekirei may also count, since he tends to Kick the Dog by making it clear he doesn't care about them at all.
Higa's Sekirei may (for the most part) count as Asshole Victims as well.
Launcher of a Thousand Ships: Minato, partially thanks to his large harem in canon. Fanfic writers pair him with just about everyone else, resulting in mix-and-matching to create new harems for him.
Narm: Benitsubasa's brutal beating of Musubi on the bridge loses some of its thunder whenever the former sticks her tongue out, causing her entire face to comically deform.
Ron the Death Eater: Musubi seems to be the least liked of all of Minato's Sekirei by fanfic writers, who often give Minato literally any other Sekirei but Musubi in their new harems for him, with some stories actually having her murdered to justify her not showing up in said fanfic. The main reasons for this stem from how "obvious" it seems she'll be the "winner" of any battle for his heart, and since that presents a major stumbling block to shippers, she gets written out or is often NOT the first one to meet him so fic writers can keep Minato's options open. As for her as a character, she does tend to get seen by some a Satellite Love Interest compared to the other Sekirei (in their defense, she can be rather ditzy), so that's another reason.
Minato's little sister, Yukari, and her #107 Sekirei, Shiina, get this reaction when it became clear to the readers that the writer had purposefully put the two on a raft to escape the city so that they wouldn't have to be dealt with in the next stage of the Sekirei plan. Doesn't help that at this point in the competition, Shiina was established to be quite an overpowered Sekirei.
Akitsu gets this reaction from many due to not joining Minato's harem, but mostly because she gets killed off shortly after she finally gets winged.
Too Cool to Live: Uzume, who inspires Minato to step up to the plate in the hope that he can restore her after winning.
Akitsu, who performs a Heroic Sacrifice literally seconds after getting winged.
Karasuba is female too. The only reason its hard to tell at times is because unlike the other women she usually doesn't go out of her way to show her femininity off in public and has a fairly gender
Visual Effects of Awesome: The winging scenes in the anime, and Homura's wings in particular are stunning.
Wangst: Tsukiumi when she doesn't get her way or time with Minato.
Woobie Species: The Sekirei, as a result of being forced to participate in a "game" that forces them to find their One True Love.....and then fight to the death with the rest of their kind in the distant hope that they might be the Final One, and earn the right to remain with their Ashikabi. It becomes even more cruel, since the odds are stacked against the vast majority thanks to the Single Numbers being more powerful than normal Sekirei. This drives several pairs to attempt to escape the game, only to be hunted down and slaughtered by the Discipline Squad.
