History Characters / NaturalSelection

* AmbiguouslyBi: She claims she's straight, but admits that she finds Satsuki attractive.

* ArmoredClosetGay: Subverted. Nonon at first assumes this to be the case with her, given that she seems to be going out of her way to try and hide her relationship with Mako, but it isn't the case. Ryuko's actually pretty open regarding her sexuality, with the main reason for her hiding hers and Mako's romance being more to keep it hidden from Ragyo, who wouldn't approve of her dating a human.
* ArtificialHybrid: She wasn't really born a hybrid, but was made one after her parents' experiments to turn her into one.

* FreudianExcuseIsNoExcuse: After Mako learns about Ryuko's alien nature and origins, she gets the idea to become a PositiveFriendInfluence to her to help redeem her from what she's become. Inumuta is quick to point out that at this point, whatever excuse she has doesn't matter. She has the blood of countless people on her hands and has taken sadistic glee in the destruction she's caused. Even if she can be made better, she ''must'' answer for the things she's done. Even she admits to Uzu that she was rotten well before either the [[spoiler:Mind Stitching]] or any of the Life Fiber nonsense became an active part of her life and that she believes she doesn't deserve sympathy for what she's done.

* EvilSoundsRaspy: See GutturalGrowler. His voice is even described as raspy at one point.
* GutturalGrowler: Has a low, raspy, mechanical voice.

* AlwaysSecondBest: Growing up, she carried a tinge of envy for her younger sisters due to them gaining all the superhuman benefits of being Life Fiber hybrids while she, as a pure human, had to work hard to keep pace with them on willpower and intellect alone.

* AntiHero: She has a noble goal and fights against the evils of the world, but she's held back from being a true heroine due to her arrogance and stoic, GoodIsNotNice attitude.

* AlwaysSecondBest: Growing up, she could never compete with Satsuki in intellectual and business fields, always coming up either mediocre or failing. Unlike the typical example, she never became envious of her elder sister because of it and it just made her look up to her all the more.

* MadeOfIron: Despite being only human, she's insanely durable on a level no human could possibly match. She's tough enough to go against Uzu, Mako, and Ryuko in rapid succession and survive a headbutt from Ryuko herself. Maiko even comments that the only person who could take an attack like that would be Sanageyama, and even then, he'd only ''barely'' be able to withstand it. Satsuki took the attack and kept fighting for much longer.

* HeroicWillpower: [[spoiler:Kamui Fukusei]] should have suffered a meltdown and devoured her the moment she put it on. Despite this, she not only forced it to heel, but took its power to fight Ryuko with. However, she ends up suffering a HeroidRROD after the fact.

* HeroicWillpower: [[spoiler:Kamui Fukusei]] should have suffered a meltdown and devoured her the moment she put it on. Despite this, she not only forced it to heel, but took its power to fight Ryuko with.

* NoBadassToHisValet: She's pretty quick to lecture Satsuki on her poor sleeping habits and generally wants her to look after herself more, even forcing her to take a nap so that she'll perform at her best. She even heavily lambasts Satsuki for [[spoiler:creating a false Kamui that almost killed her]], as well as her general lack of concern for her own personal well-being.

* BoobsOfSteel: She's the physical powerhouse of the Elite Four, specializing in a fisticuff oriented battle-style, and she has a large rack that Ryuko can't help but stare at.

* HurtingHero: She's deeply scarred by her past and failures and is prone to lashing out at herself, but keeps on pushing forward to save the world regardless.

* AcheyScars: His scars tend to start paining him whenever Ryuko are her injustices are involved, usually urging him to be more reckless in his desires to retake Honnouji from her.

* EveryoneHasStandards: Part of the reason he dislikes Ryuko is she allowed delinquents like [[GunNut Beros]] [[GyaruGirl Goyle]] and Ryosuke to become presidents.

* HolyBacklight: {{Inverted|Trope}}. She has the Kiryuin backlight that her sister and mother have, but hers is a demonic blood red, reflecting her sadism and blood-lust. In flashbacks, it used to play this straight, with Mako's POV describing it as "a beautiful shade of warming red" akin to the sunset.

* AuthorityEqualsAsskicking: She's the CEO of REVOCS, an organization that lists [[BloodKnight Ryuko]] and [[HumanoidAbomination Nui]] as members, and she's stronger than both of them.

* AuthorityEqualsAsskicking: She's the Grand Couturier of REVOCS, placing her just under Ragyo and Ryuko in importance to the company. She's also the Vice President of Honnouji's student council, and is inhumanly powerful when carrying out her duties in either role.

* FatalFlaw: '''{{Pride}}'''. Satsuki's so used to being self-sufficient that she seeks to solve the Life Fiber problem by herself, refusing to ask for help even if she's heavily injured. The closest she comes to collaboration is to demand that Nudist Beach hand over the Rending Scissors, which does nothing to engender them to her cause. Her incredible strength also keeps her from believing that anyone else can fight REVOCS and her sisters to the same degree that she can. [[spoiler:Isshin Matoi even outright tells her that if they want make any meaningful progress against Ragyo, then she needs to suck it up and stop being so prideful]].

* FiveManBand: Ryuko's student council consists of:
** BigBad: Ryuko herself, the Tyrant of Honnouji and scion of REVOCS.
** TheBrute: Uzu, her sparring partner and main leader of her forces.
** TheDarkChick: Maiko, of the middle-managing, backstabbing variety.
** TheDragon: Mako, her girlfriend and confidant, and the last person Satsuki needs to get through to fight Ryuko.
** TheEvilGenius: Houka, for a certain definition of [[GoodIsNotNice evil]].