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    In General 
The main characters of the series.
  • Battle Harem: Very much so. Each of the characters has high level combat capabilities and can kick your ass. As a group...
  • Color-Coded Wizardry: Each of the nine girls is associated with a color that's quite fitting with their personality and abilities (which also aligns with the color-coding of Folsarian magic). This only appears when they fuse and when at least two girls fuse, they instead form the Goddess of Dawn. It's also used as an accent color on their Satomi Knights uniforms.
    • Red - Theia, being the one who focuses most on offense with the Blue Knight.
    • Orange - Clan, due to her skill as an inventor and can cover her appearance using her inventions.
    • Yellow - Ruth, the reinforcement and intelligence group.
    • Green - Kiriha, the most intelligent of the girls and the main strategist.
    • Blue - Yurika, the one who uses healing magic. Summoning acid and poison clouds also falls under this.
    • Indigo - Maki, the previous Dark Navy and mind manipulator.
    • Purple - Sanae, the spiritual energy expert.
    • White - Alaia/Harumi, the Goddess' avatar and the bearer of Signaltin.
    • Black - Shizuka, martial arts expert and host of Dragon King Alunaya.
  • Everyone Is Related: Turns out that each of the characters have some connections to another, and all of them are connected to Forthorthians and Koutarou.
    • Sanae was kidnapped by the former Dark Navy Maya as a kid and results in the current day Sanae-chan. Her mother is also Nana's cooperator during her time as a magical girl
    • Theia, Clan, and Ruth are all pure Forthorthians.
    • Yurika and Maki (and all of Folsaria) are descendants of Grevanas and Ancient Forthorthian magicians.
    • Kiriha and her people have Forthorthian blood in them as they're descendants of Maxfern and Ancient Forthorthian alchemists thus making them Uneven Hybrid of Japanese humans with Forthorthian blood.
    • Harumi is the reincarnation of Alaia, former Forthorthian Empress.
    • Shizuka has Alunaya, an Ancient Forthorthian dragon inside her, which saved from the fire that killed her parents years ago.
    • In fact, Elfaria theorizes that most of Kisshouharukaze have Ancient Forthorthian blood in them when Maxfern and his people arrived at Japan thousands of years ago and intermingled with the natives, which is supported by Maki stating that Darkness Rainbow are mostly active in there despite the fact that they operate worldwide note . Meaning: every "real" Earthlings (Koutarou, Harumi, Sanae, and Shizuka), could biologically also have alien blood in them.
      • The opposite could also be true, as Clan rewrote the genes of Forthorthians 2000 years ago, with the basis being her -a modern-day Forthothian- and Koutarou's -a modern day human- genes.
    • And all of these happened because of Koutarou and Clan's journey.
  • Fantasy Kitchen Sink: It seems like this at first, what with the ghost, magical girls, mole person, and the Human Aliens, but as noted above in Everyone Is Related, the "Kitchen Sink" breaks down when it turn out that everything is connected to ancient Forthorthe.
  • Fire-Forged Friends: With the exception of Shizuka, Harumi, and Ruth, Koutarou and the others' first interactions are this.
  • Laser-Guided Amnesia: All of them lost their memories of the events in volume 29. Though it's by their own accord.
  • Literal Split Personality: The invaders each represent a part of the Goddess of Dawn; from their personalities, abilities, and even insecurities. This isn't limited to the current invaders, as others like Elfaria and Celeishu took the title in other realities.
  • Magic Enhancement: As of book 30, by calling on their bond to the sword Nalfalaren all the invaders can use a small amount of magic in their respective colour (e.g. Theia surrounding her attacks in a red aura which increases their destructive power).
  • Magic Knight: Lampshaded in Volume 30
  • Next Tier Powerup: Both Koutarou and his Battle Harem eventually get new tricks and power-ups to keep up with the villains.
  • Pieces of God: All the invaders turn out to be aspects of Nalfa Laren, Goddess of Dawn and creator of the universe. Though they represent a part rather than be a piece themselves, as shown in several alternate realities where other girls take the role.
  • Summon to Hand: After jointly investing their power into the swords Signaltin and Saguratin, all the invaders gain the ability to summon them to their location.
  • The Three Faces of Eve:
  • True Companions: They eventually become this.

    Koutarou Satomi 

Koutarou Satomi

Voiced by: Yuichi Nakamura

A high schooler who inhabits Room 106 of Corona House due to its cheap monthly rent of 5,000 yen. Unfortunately for him, his room ends up being a Weirdness Magnet inviting all sorts of "invaders" after it.

  • Accidental Pervert: Finds his head, and then his hands, somewhere very unfortunate when Theiamillis comes through the wall for the first time.
  • Becoming the Mask: Despite just trying to "act" as the Blue Knight in Ancient Forthorthe, he gets more and more into his "role" to the point that he shouted a quote from his "script" without even realizing it.
  • Big Damn Heroes: As befitting the Knight in Shining Armor, he gets lots of these. When he presents Theia with the scoreboard for the room competition and swears allegiance to her right before she has to go home is probably one of the most romantic scenes in the whole series.
  • Book Dumb: At least in comparison to (most of) the girls.
  • Berserk Button: NEVER hurt those dear to him. He will go hell and back to save them and make you suffer.
  • Chaste Hero: Nine girls, two years (by the end of Vol 27), has received FOUR cheek kisses (and a couple actual ones), yet still single.
  • Chick Magnet: Every girl trying to take over his apartment loves him, followed by his Club President and about any other female he comes to know personally. And taken way beyond if you consider the female students who are too afraid to confess to him, and his fangirls as the 'Blue Knight' (both Earthling students and the millions of millions of Forthorthians spanning from 2000 years ago to present day).
  • Commitment Issues: While he is actually fairly open about his affection for all the invaders, moving beyond being Just Friends is going to take a lot of work.
  • Determinator: One of the things that make him so knight-like in the first place. Even on the brink of death, he will still stand up in order to protect the girls.
  • Drill Sergeant Nasty: of the absolutely implacable but pleasant style, when he's helping Yurika study.
  • Dual Wielding: Does this with Saguratin and Signaltin from time to time.
  • The Gadfly: He's both on the giving (to Theia, Clan, and sometimes Harumi) and receiving (from Kiriha, Elfaria, and sometimes Shizuka and Harumi too) end.
  • Good Flaws, Bad Flaws: Due to his Dark and Troubled Past, he always notices those around him and helps them when they need it, but at the same time, tries not to depend on anyone else. This causes trouble for the girls, especially when he accidentally hurts them.
    • It manifests specifically as an absolute determination to keep his promises but with zero expectation that anyone else will keep theirs.
    • Thankfully after Theia and Kiriha calls him out on this, he has been trying to suppress his tendency to avoid getting help and be more careful on what he says.
  • Harem-Powered:
    • This is a very downplayed trope, played in a more practical, long-term method than usual. Satomi finds himself in situations where one of the girls in his harem teaches him some type of skill (such as swordfighting) or bestows upon him an item or skill (like a sword or armor) that slowly starts to turn him from an Ordinary High-School Student into the spitting image of the legendary Blue Knight. This alludes to the fact that Satomi is, in fact, said Blue Knight and most of the girls have some sort of connection with him.
    • Lampshaded in volume 25 after one of the girls Harumi is taken out of commission at a critical juncture which severely cuts his combat capability.
    • Taken Up to Eleven in volume 26 when all the girls take part in remaking his Infinity +1 Sword.
  • Harmful to Minors: His mother died in front of him when she saved him from a traffic accident.
  • House Husband: He learned homemaking skills for the sake of his dad after his mom died. He takes care of Clan during their time in ancient Forthorthe and takes over for the house duties when the girls are all busy creating Nana's replacement parts.
  • Idiot Ball: Thinks the Sun Rangers in episode 10 are holding one after all five of the group show up in the same costume and have the same name, and berates them for it.
  • I Just Want to Be Normal: Would really rather live as as an Ordinary High-School Student and have a normal life. Admittedly, one with his nine girlfriends.
  • I Know Mortal Kombat: Got trained in swordsmanship as a way to rehearse playing the Blue Knight in a play, then actually had to use those skills when he became the actual Blue Knight.
  • Jack-of-All-Trades: Seems to fit this in the group. He can tap into Aura Vision and Super Reflexes, but not as well as Sanae; he can't use magic like Yurika, Maki, or Harumi, but has a magical barrier cast on him by the former and can ask Signaltin to cast spells for him at the cost of exhausting its power for a while; he uses Forthorthian technology like Theia, Ruth, and Clan, and a spiritual-energy weapon like Kiriha, but doesn't completely rely on them.
  • Knight in Shining Armor: Theia specifically trains him to act and fight like one so he can play the role of the Blue Knight flawlessly. This causes a Stable Time Loop when Koutarou is sent back in time and impersonates the Blue Knight as Theia taught him only to end up becoming the Blue Knight from the legend.
  • Lady and Knight: His invader harem notes he treats Harumi differently from them, acting like a knight who wants to protect his princess. It's foreshadowing to Koutarou eventually traveling back in time to become the legendary Blue Knight who protected the Silver Princess, Harumi's past incarnation.
  • Living Emotional Crutch: To Maki before she started to bond with the others.
  • Male Might, Female Finesse: In swordsmanship, he's the athletic Dual Wielding knight compared to Ruth's quick, rapier-like style.
  • Marry Them All: When he chose the Goddess of Dawn
  • Master Swordsman: He's personally trained by Theia and developed a competent level while wearing the Blue Knight (ship)'s armor and also using spiritual energy. But after his experiences in ancient Forthorthe, he's skilled enough to block bullets.
  • Nice Guy: Despite being skeptical of all of the girls' claims for his room, he is still willing to help them out when they have problems.
  • One-Handed Zweihänder: He dual-wields a pair. Though that happens after making adjustments to his armor since realistically it wouldn't happen normally.
  • OOC Is Serious Business: When he has a serious face, there may be a huge problem. More so if he's livid.
  • Older Than He Looks: Downplayed. After several months of travelling in the past and freezing time for 2000+ years, he doesn't look that different after disappearing.
  • Ordinary High-School Student: He was a high schooler like any other until his new apartment is invaded by ghosts, Magical Girls, underground people and aliens. He also becomes a legendary knight and the literal reason why the universe exists via Time Travel.
  • Please Don't Leave Me: His greatest fear. This is why he initially wasn't as attached to the others as Yurika, since he's afraid everyone he loves will be taken away from him like before. From his point of view, everyone besides Yurika will eventually leave him, so he didn't want to get too close with anyone. It's also the source of his flaw
  • Powered Armor: Theia's ship Blue Knight comes with a powered suit styled after the hero's medieval armour, which doubles as a motion control device for ship-to-ship combat. Theia initially lends it to Koutarou as his costume for the play, and later he pulls it out whenever he's expecting a serious fight. It comes with Deflector Shields and a Jet Pack, and also incorporates a gauntlet from Kiriha that can turn Koutarou's spiritual energy into fire and lightning.
    • In volume 15 it receives a Mecha Expansion Pack in the form of the "Garb of Lord", a shoulder attachment which provides an additional barrier and point-defence system.
  • Real Men Wear Pink: Despite his talent in baseball, he chose to enter the knitting club. For reasons left unexplained, it seems to have something to do with wanting to make his current project himself. He's also a good cook which is helpful in ancient Forthorthe.
  • The Rival: While Vandarion is his arch-enemy, Elexis has a more friendly term with him, even easily putting an Enemy Mine.
  • Shut Up, Hannibal!: Punches Tayuma in episode 11 when he details his plans to kill Kiriha and blame the surface world for her death.
  • Stable Time Loop: Due to Time Travel shenanigans with Clan, he just happens to be the boy Kiriha fell in love with as a child, the reason Maki became Dark Navy, the inspiration for Theiamillis' ship the Blue Knight, the actual Blue Knight, and also inspired God(dess) to create the universe.
  • Stock Light-Novel Hero: Up to Eleven. Koutarou is an Ordinary High-School Student who gets an Unwanted Harem of cute supernatural girls who are fighting over his apartment. That's pretty standard until later in the light novels where Time Travel shenanigans turn him into the legendary Knight in Shining Armor of another planet, he meets some of his harem members in the past and makes them fall in love with him before he ever met them. Oh, and he inspired a Physical Goddess to create the universe out of love for him so she could make him fall in love with every aspect of her, which took the form of every girl in his harem.
  • Super Wrist-Gadget: After his travels with Clan, he receives a Forthortian communicator which he can use to summon his sword and armour.
  • Thanks for the Mammary: Does this to Theiamillis accidentally when she pops into his room through a portal.
  • Took a Level in Badass: Getting Theia's training gave him some steps of this, but going through the events of volume 7.5 and 8.5 definitely did this.
  • Training from Hell: Subjected to excessive "knight training" from Theiamillis in episode 7 to ensure he performs the role of the Blue Knight in the play she wrote.
  • Tranquil Fury: After Alaia and Charl are kidnapped, he acts calm as to not alarm others, but his gestures shows he's livid. A similar case happens in Volume 13 after the girls are badly injured, where his actions speak for themselves.
  • Tsundere: Very downplayed. He's not really a Type 1 or 2, but as a man he just can't admit that he greatly cares for the girls upfront.
  • Weirdness Magnet: Thanks to an artifact awakening near the rokujyouma he rented, he attracts a ghost, two magical girls, a mole person, a landlady with a dragon, an alien princess, and a jedi servant.
  • Wise Beyond Their Years: Downplayed, though it says a lot when a high-school student has experience in war, especially as a general among other experiences he gained in ancient Forthorthe.
  • Unwanted Harem:
    • Develops one right away after moving into his new apartment. Thing is, none of them are actually interested in him yet, just his living space. However, they do gradually fall in love with him as they spend more time together and he helps them out with their various issues.
    • There are intended harems inside the harem: Yurika seeks this with Sakuraba, Satomi and herself, while Theia intends to share Satomi with Ruth (and she is quite upfront about this).
  • You Will Be Beethoven: When he is sent to Ancient Forthorthe and saves Alaia, Clan explains that he has gotten in the way of her meeting with the Blue Knight. In order to create a Close-Enough Timeline, he continues to act as the Blue Knight, while Clan travels around to find the real one. It turns out that the Blue Knight was his time-traveling self in the first place.

    Sanae Higashihongan 

Sanae Higashihongan

Voiced by: Eri Suzuki

A ghost who haunts Room 106. The first "invader", she wants Koutarou out of her "home."

  • A-Cup Angst: Downplayed in the anime, but she's just as jealous about Kiriha's chest as Theia is. Her first words to Theia after returning to her body? State her breasts got a little bigger
  • An Astral Projection, Not a Ghost: She's initially believed to be a ghost, but she's really the result of a failed attempt to steal the life force of a powerful psychic, which inadvertently left behind a clump of energy so concentrated that it took on the original person's appearance and personality, creating an "artificial ghost". Eventually she fuses with her human self, after which she takes the appearance of her ghost form while using Astral Projection.
  • Aura Vision: Capable of reading peoples' auras to judge their personalities, relationships, and how they're about to move in a fight.
  • Cute Ghost Girl: Volume 1 notes that she looks close to elementary school age. Calls herself adorable, no one objects.
  • Death Amnesia: After she remerges with her physical body, Sanae forgets her memories of being a ghost in Room 106. She later recovers them.
  • Energy Bow: After her power increases, Sanae begins to favour crafting a Sacred Bow and Arrows out of spiritual energy, which she excitedly refers to as "Sanae-chan God Arrow!"
  • Genki Girl: Probably the most energetic out of all the invaders.
  • Haunted Fetter: Initially bound to Room 106 and unable to travel far away, she soon manages to snap her fetter out of desire to help her friends. By the end of Volume 10, Sanae considers her friendship with Koutarou more important than her desire to reunite with her parents, and her fetter has fully transferred to him. As Sanae is a powerful ghost who must continuously absorb vast amounts of Life Energy from her fetter in order to survive, this is a very bad thing for both parties.
  • Inconsistent Coloring: Her purple hair got changed to light orange in later volumes of the light novels.
  • Laser-Guided Amnesia: She loses her memories as a ghost (and to an extent, everything about Room 106 once she returns to her human body in Volume 11. Thankfully, they return in the same volume.
  • Literal Split Personality: She (Sanae-chan) can project herself out her body, while Sanae-san controls it.
  • Mind over Matter: Part of her power set.
  • Next Tier Powerup: Merging with the human Sanae in Volume 11 restores her full spiritual power, which is likened to that of a minor god. This makes her spiritual attacks much stronger, as well as allowing her to imbue her power into objects.
  • No-Sell: Her attacks have no effect on sacred objects.
  • Older Than She Looks: Being a ghost and can't physically age, it possible she's older than her appearance suggests. She's actually around the same age as the others.
  • Physical God: While she lacks any reality-warping abilities, her spiritual energy after merging with herself is compared to a minor god's. To give indication, she can output so much spiritual energy that she glows in everyone's sight just for fun; mind you, this breaks the laws of physics.
  • Power Glow: Discussed as an indication of just how much spiritual energy she has to spare.
  • Psychic Powers: Sanae is established early on to be unusually powerful and stable for a ghost. It's later revealed that her telekinesis, Aura Vision and other powers are actually something she always had, and becoming a ghost simply helped her learn how to use them properly.
  • Red Oni, Blue Oni: Funnily enough, to herself. One's a Genki Girl, the other's a Shrinking Violet. With the way they talk to each other, it almost seems like Polar Opposite Twins, even though they're only one person.
  • Split Personality: Zigzagged. After recovering her memories as a ghost in her human body, she can astral project the 'active, cheerful, ghost Sanae-chan' while the 'shy, timid, human Sanae-san' stayed in the human body. Though their/her soul is still connected.
  • Super Empowering: After a while of Sanae possessing Koutarou in order to share his sense of taste, they become compatible enough that Sanae can return the favour by lending him her Aura Vision. Still later she figures out how to set up "spiritual circuitry" in Koutarou's body which can function to some degree even when she's not present - this includes a lesser version of Aura Vision, as well as a form of Super Reflexes (letting him bypass his nervous system and transmit signals around his body instantly).
  • Weaksauce Weakness: Sacred objects and charms. She's later immune to Koutarou's “Safe Family” Charm since he considers her as family before losing it entirely after merging back with her body.
    • She loses this weakness entirely after reuniting with her body
  • When You Coming Home, Dad?: A parental and non-work-related example. She’s waiting in Room 106 for her parents to come home again. It’s revealed that her family moved into her father's family house near a hospital to try cure her from leaking too much spiritual energy, which was was both the source of her manifestation and slowly killing her physical body (and by extension, her).
  • Vitriolic Best Buds: She had this Koutarou before making up in Volume 3.
  • You Gotta Have Blue Hair: She has violet hair.

    Yurika Nijino (Rainbow Yurika) 

Yurika Nijino

Voiced by: Nichika Omori

A clumsy Magical Girl who intends to claim Room 106 to defend it from other magical girls who may use the power the room contains for evil.

  • Adorkable: She's a clumsy Magical Girl that tends to be mistaken as a cosplayer.
  • Apologizes a Lot: Tends to do this, such as when she accidentally breaks the window during her intro.
  • The Archmage: It's easy to forget, but in Folsaria she holds the highly prestigious title of Archmage (being the current "Blue" of Rainbow Heart).
  • Ascended Fangirl: She's a big fan of Magical Girl shows and Shoujo manga. And no, she can't properly act as the former.
  • Bare Your Midriff: Her second Magical Girl outfit (strongly implied to be created by the Cosplay Club).
  • Because You Were Nice to Me: She adores Harumi because she's the only person to treat her kindly and believe in her Magical Girl powers.
  • Butt-Monkey: Poor Yurika never catches a break. She constantly messes up her tasks because of her clumsiness, no one takes her claims of being a Magical Girl seriously and is treated like a nuisance more than any of the other invaders.
  • The Cassandra: Despite her claims and evidence of her being a true Magical Girl, her roommates keep brushing her off as a cosplayer who's way into her role.
  • Character Development: As the story proceeds, she gains more confidence in herself and can make better use of her talents.
  • Cute Clumsy Girl: She's clumsy, insecure, and apologetic.
  • The Eeyore: Downplayed, but she's the most pessimistic out of all the main characters, especially when it comes to her poverty.
  • Establishing Character Moment: She first appears by smashing through a window with her (flying) broom crying, and crashing, resulting in some Amusing Injuries. She later introduces herself nervously and nobody believes she's a magical girl. All that's missing now is her Big Eater tendencies.
  • Expy: Super clumsy, whiny, big eating, Book Dumb, twin tailed, Magical Girl of 'Love and Courage'. Who else could it be.
  • Fusion Dance: One of the available spells under Orange magic. Oddly enough, when she fuses with other invaders, they manifest the Goddess of Dawn rather than a person with traits from the fusees.
  • The Gadfly: Tries to be this when she rarely one-ups Koutarou. Keyword: tries.
  • Genius Ditz: She is legitimately very, very, very good at magic (volume 19 suggesting that she reached the rank of archmage faster than anyone in history), just a wreck at everything else. Regarding school specifically, the speed with which she improves under Koutarou's Training from Hell suggests she may just be uneducated rather than Book Dumb. Kiriha suggests that it is a result of lack of focus.
  • Girlish Pigtails: She wears her hair in long twin tails, emphasizing how clumsy and inexperienced she is.
  • Irony: Magical Girl Rainbow Yurika, princess of love and courage, is insecure and apologetic and has developed a specialty in poison gas and acid cloud attacks, much to her dismay.
  • Living Emotional Crutch: Downplayed. Part of the reason Koutarou finds it so hard to believe that Yurika is a magical girl is because he's happy to have another "normal person" in Room 106, and doesn't want to see someone as timid as Yurika forced onto a battlefield. It's actually much deeper than that
  • Meaningful Name: Nijino means of Rainbow; she literally just translated her Folsarian name into Japanese.
  • Pretty Freeloader: Aside from Koutaro (and Sanae), she's also staying in Room 106 but he's the one taking care of her. That aside, she's adorably klutzy.
  • Rapunzel Hair: Her Girlish Pigtails reach past her hips.
  • OOC Is Serious Business: The situation is the Folsaria Arc was bad enough that her comic-relief clutziness is not happening. All the main characters take note of it.
  • Shipper on Deck: For Harumi x Satomi, but doesn't get why she keeps includingherself with them when she imagines them together.
  • Story-Breaker Power: Lampshaded in the afterword of volume 19 - the reason Yurika has low self-confidence and an oath against using magic for personal gain is because her powers would have utterly broken the story at the point she was introduced. By the time she can show her full strength openly, the other characters have received Next Tier Powerups which help them keep up and the problems have gotten bigger than she can solve on her own.
  • Stripperific: Her Magical Girl outfit isn't that revealing, but after being tossed out of Room 106, she breaks down in tears and sobs that her outfit "doesn't cover [her] chest or butt all the way, but the Magical Land says [she] has to wear it proudly". The Uniform like her Staff belonged to her predecessor and teacher Rainbow Nana who was both shorter and "smaller" than Yurika.
  • Take Up My Sword: Yurika was a friend and supporter of the original Magical Girl, Rainbow Nana. She had to take up Nana's role after she lost her powers protecting Yurika from an ambush by Darkness Rainbow, which explains a lot of her apparent unsuitability for the job.
  • Taking the Bullet: Does this in episode 8, intercepting a spell cast by her rival Maki that was intended for Harumi. She ends up apparently paralyzed by the spell, and falls straight down after getting hit by the spell.
  • Trademark Favorite Food: Noodles
  • Transformation Sequence: In episode 3 right before trying to heal Harumi.
  • Zettai Ryouiki: In both her school and Magical Girl uniforms.

    Kiriha Kurano 

Kiriha Kurano

Voiced by: Masumi Tazawa

A well-endowed member of the Kurano clan, a family of oracles and spellmasters who live deep underground.

  • The Ace: She plays the perfect student to a T when she’s at school.
  • The Chief's Daughter: The daughter of the chief of the Underground Dweller.
  • The Gadfly: She loves teasing people using her intellect, especially Koutaro.
  • Going Native: Mentions to Satomi about her plan to invade the surface via peaceful methods, such as helping people out with cleaning, etc. However, her real motive was to find the boy she met and fell in love with on the surface ten years back, and she didn't want to start a war which would make finding him impossible.
  • I Am Not Left-Handed: Koutarou soon realises that Kiriha is smart enough that she could have taken over Room 106 long ago, but is deliberately holding back to keep the invasion going and the radical faction from moving.
  • I Want My Beloved to Be Happy: She goes into her invasion fully aware that her First Love was most likely with someone and living his own life happily after ten years. She just wants to make sure of that and bring that chapter of her life to a close. Then she finds out who he really is...
  • Lady of War: While she's one of the weaker members of the cast and mostly relies on her haniwas to fight for her, in bigger fights she'll pull out a spiritually-enhanced naginata and join the fray herself.
  • Miko: Has the look, and comes from a clan that's mastered oracles and incantations.
  • Precocious Crush: Ten years ago, she fell in love with a boy more than twice her age. She's primarily holding back the invasion to give herself a chance to find him again and give herself some closure. In Volume 10, she finds out that the boy in question was a time-travelling Koutaro, meaning the age gap is gone, and she actually has a real chance with him.
  • Rapunzel Hair: Her hair is as long as she's tall.
  • Secret Keeper: In book 30 it's revealed that after the events of the previous book, Kiriha received a letter from herself explaining that everyone had recently agreed to erase something from their memories, and appointed Kiriha to ensure they don't look too deeply into any of the inconsistencies that might arise. This included sealed instructions for how to undo the process in case of emergency.
  • Sex Sells: Kiriha attempts to do this to Koutarou when he rejects her gold offer to leave the room. She then asks him how long he's able to resist, since her people have been underground for a long time. Fortunately Theiamillis showing up provides a convenient distraction.
  • She's All Grown Up: Compare the child Kii to the current Kiriha. Even Kotaro couldn’t tell ‘Kii’ was her and lampshades this.
  • Split Personality: Though not really. After finding out Kotaro was the man whom she met 10 years ago, she can shift from the 'mature Kiriha' to the 'child Kii'. This is in part due to her role as Chief's daughter.
  • The Strategist: The smartest member of the group, but also the one with the lowest personal fighting power. As the series becomes more action-oriented Kiriha increasingly finds herself in command, particularly when the heroes work alongside groups of weaker combatants. She's notoriously good at it, to the point of successfully outmaneuvering enemies who can see into the future on more than one occasion by using simple common sense.
  • Take Over the World: What she wants to do. Ultimately subverted, as she really wants her people to live peacefully with the surface world. Unfortunately there's a faction of underworlders that really does wish for conquest - Kiriha's token invasion was merely a political maneuver intended to reduce their influence.
  • Third-Person Person: Calls herself 'Kii' as a child. Even as an adult when she acts as Kii.
  • Wacky Marriage Proposal: Not really marriage, but she makes Koutarou choose between "(Kiriha) invading his life" (which he lampshades sounds like marriage) or "never seeing (Kiriha) again" in the end of Volume 17. Of course, he picked the former.
  • You Gotta Have Blue Hair: Literally blue hair.

    Princess Theiamillis Gre Fortorthe 

Theiamillis Gre Fortorthe

Voiced by: Maria Naganawa

The princess from the Mastir family and the seventh princess of the Holy Forthorthe Galactic Empire.

  • Ace Custom: In book 30 she modifies one of Ruth's Attack Drones for her personal use, giving it a more ornamental appearance evoking a red-and-gold knight.
  • A-Cup Angst: She is a bit touchy about her breast size. She is canonically the smallest invader including ghost Sanae who is described as looking like she is in elementary school. She and Koutarou have a very sweet conversation about it in Volume 12.
  • Ace Pilot: Famous in Forthorte for her crack-shot aim and her outstanding record in simulated dogfights, having already surpassed her own mentor.
  • Affectionate Nickname: "Tulip" is an adorable nickname, but she misinterprets it as some insult (being an alien). Once she sees actual tulips, she realizes this and sometimes makes Koutarou use it.
  • Antiquated Linguistics: Speaks in this manner, using the archaic, feminine "warawa" to refer to herself.
  • Battle Ballgown: In volume 16, she completes the "Combat Dress" - a kind of high-tech harness with a big poofy skirt, which both allows her to fly and provides hardpoints that let her wield multiple summoned weapons at once.
  • Benevolent Boss: To Ruth. Justified, as they have been friends since childhood.
  • Catchphrase Insult: She likes to call Koutarou "Neanderthal."
  • Character Development: During her stay on Earth, she goes from a selfish Royal Brat princess who wants to capture the rokujouma and make the others in Room 106 swear loyalty to her (albeit not without reason) to a proper princess capable of being a suitable empress that looks out for her friends. Everyone, even Theia herself, lampshades this.
  • Childhood Friends: She and Ruth have been together since childhood and are like sisters to each other.
  • Compliment Backfire: She doesn't like being called "Tulip" at first because, being an alien, she didn't even know what tulips are and just assumed it was an insult. After she sees tulips, she takes a liking to her nickname.
  • Cute Little Fang: Sports one quite frequently in the anime usually when shes about to put the beast down on someone.
  • Deflector Shields: Wears a personal barrier generator which works well against conventional weapons, but offers little defence against spiritual energy attacks like those used by Sanae and Kiriha.
  • Defrosting Ice Queen: She warms up considerably towards Koutarou after the Blue Knight play.
  • The Dividual: With Ruth, especially with regards to their romantic relationship with Koutarou.
  • Gamer Chick: Her thesis, back on Forthorthe, was on the ancient history of video games and she is the most likely person to be seen actually playing them.
  • Gratuitous English: Her Blue Knight, as well as her fan club in episode 3, makes notable use of this trope by using a lot of English in their dialogue, such as "Hail to the Princess!". That said, the language is still new to her without her translation device.
  • Identical Granddaughter: Well, identical descendant of Princess Alaia's little sister Charl. Foreshadowed by Theia playing the role of Charl in the Blue Knight play.
  • In-Series Nickname: "Theia". Also "Tulip".
  • Multi Form Balance: Her Combat Dress, introduced in volume 16, can have weapons docked to it in a number of preset configurations, four of which are known:
  • Noblewoman's Laugh: Theia has a habit of laughing in this manner to belittle others or show off her own greatness.
  • Ojou: Noble Womans Laugh with fan? Check. Devoted servant? Check. Ridiculously wealthy (private spaceship)? Check!
  • Overly Long Name: Theiamillis Gre Mastir Sagurada von Forthorthe.
  • Powered Armor: Her "Combat Dress" introduced in volume 16 is a minimalist one focused less on defence (which is already covered by her personal barrier) and more on providing mobility (via a Jet Pack) and firepower (via antigravity hardpoints for her weapons), with the whole thing being compared to a wearable fighter jet.
  • Pretty Princess Powerhouse: The princess of a galactic empire capable of beating up the Chearleading Club, wielder of a BFG, and owner of a 1 kilometer long Giant Robot Spaceship. She's also a really good pilot and combat commander, famous for taking the vanguard position.
  • Rapunzel Hair: Her hair is long enough to reach down her knees.
  • Royal Brat: She starts off as a haughty and arrogant princess. She gets better later on.
  • Royals Who Actually Do Something: She's willing to go on the frontline on a battlefield, and more than capable of backing herself up.
  • Shana Clone: Theia is a prideful and arrogant Tsundere alien princess with a small, flat-chested body that gives her A-Cup Angst and has blonde Rapunzel Hair. She initially treats Koutarou as her inferior and calls him a "Neanderthal", but ends up falling in love with him and her behavior towards him improves as a result.
  • Small Girl, Big Gun: At the start of the series her fighting style consists mostly of summoning in a giant gun from her ship. While powerful, most of these weapons are cumbersome enough to reduce her to a living Sentry Gun, and she can't switch between them quickly. Later on she develops the Combat Dress to compensate for this weakness.
  • Super Wrist-Gadget: Wears a computer on her wrist which she uses to communicate with her ship.
  • Tiny Tyrannical Girl: She's introduced as a small Royal Brat alien princess who immediately demands Koutarou to obey her so she can claim control over his apartment room. As the series progresses, she mostly acts this way toward Koutarou as a joke and sign of affection.
  • Tsundere: Harsh Type. She's very harsh and haughty towards Koutarou when they first meet, but since the Blue Knight play, she's becoming quite open in declaring her attraction to him.
  • Uptown Girl: Theiamillis, as the princess of a galactic empire, angsts about the political implications of making some nobody teenager from a backwater planet with no diplomatic relations to Forthorthe her husband.
  • Vitriolic Best Buds: As everyone lampshades, Theia and Koutarou's roughhousing is their way of displaying affection to one another.

    Ruthkhania Nye Pardomshiha 

Ruthkhania Nye Pardomshiha

Voiced by: Saori Hayami

Theia's servant and a Guardian Knight from the Pardomshiha.

  • Arranged Marriage: And the major plot driver of Volume 9
  • Attack Drones: In some fights she backs up her swordplay by micromanaging a group of drones from the Blue Knight. Volume 24 has Clan explain that she is incredibly good at this, to the point where she can manually perform complex maneuvers that would normally require custom programming (including combining their shots to strike targets beyond the weapons' normal maximum range).
  • Battle Butler: She might be serving Theia as a servant, but she’s still a knight who can kick your ass.
  • Berserk Button: Because of one incident in which Koutarou made Ruth think rhinoceros beetles are more important to him than her, Ruth absolutely hates the insect. She'll go berserk if she's sees one, even if it's a Beetle-themed superhero! She loses her memory of going berserk when she regains her senses.
  • Beware the Nice Ones: She's calm, gentle and understanding. Just keep rhinoceros beetles away from her, she'll enter an Unstoppable Rage if she sees one.
  • Bodyguarding a Badass: She's guarding Theia, who can kick ass. When not on battle, she's the maid/servant type.
  • Childhood Friends: She has been Theia's closest friend and confidant since childhood.
  • Clingy Jealous Girl: She's fine with Koutarou being with Theia, but tends to get easily jealous at the thought that Koutarou may pick someone else. It's Played for Laughs in the case of rhinoceros beetles; Ruth will fly into a rage at the mere sight of one because she thinks Koutarou likes them more than her.
  • The Conscience: She's Theia's voice of reason and often keeps her from taking her bratty behavior too far. Koutarou mentions it would be a lot harder for him to deal with Theia if Ruth wasn't there to regulate the princess.
  • Curtains Match the Window: She has blue hair and matching blue eyes.
  • The Dividual: with Theia, when it comes to their (romantic) relationship with Koutarou.
  • The Dreaded: Her rhinoceros beetle-crazed mode is feared by everyone who see it. Even robots who are supposed to be simple, mindless automatons instinctively step back in fear.
  • Dual Wielding: She can wield her swords as this.
  • Fragile Speedster: This is her swordsmanship which she adapted from her ancestor, Flair; quick and swift strikes using her Laser Blade in exchange of great defense.
  • Item Caddy: Noted for her great sense at "managing" things, which includes multitasking and making the most of complex/versatile equipment. When she returns to Forthorte in volume 24, her father is awed by how far she's managed to take these talents beyond their previous Mundane Utility.
  • Knightly Sword and Shield: Initially uses a sword and shield to fit her image as a knight, packed with advanced technology to the point where they practically do the fighting for her. She discards them in later books, realising that she's more effective with unconventional weapons like Laser Blades and Attack Drones.
  • Laser Blade: Takes to wielding them after she starts training with Koutarou, which proves to fit her fighting style better than the heavy blades she previously used.
  • Legacy of Service: She hails from a long line of knights that have served the Royal Family of Fortorthe for ages.
  • Master Swordsman: Surprisingly averted early in the series - despite Ruth being Theia's knight, complete with sword and shield, she is only an average combatant who relies more on her equipment than personal skill. In fact Theia is both more athletic and more skilled with a sword than she is, even if she rarely gets to show it off. However, Ruth takes notice of this and starts sparring with the other invaders, after which her skill improves by leaps and bounds.
    • After continuously sparring with post-Blue Knight Koutarou, she improves and when she's beetle-crazed, she might be better than the person who literally fought in a war as a knight.
  • Male Might, Female Finesse: In swordsmanship, her quick and swift style using her Laser Blade contrasts Koutarou's Dual Wielding.
  • Nice Girl: Possibly the nicest and calmest of Koutarou's invader roommates. That is, unless rhinoceros beetles are involved...
  • Secret Keeper: After finding out that Koutarou is the Blue Knight form the legends, he convinces her not to tell Theia, as it would definitely affect her judgement.
  • Senpai Kouhai: A variation. Since Koutarou is the Blue Knight who's the highest ranking knight and "leader of the knights", that would make him her superior. Hence why she later starts calling him Master
  • Super Wrist-Gadget: Wears one of the same model as Theia's, though she uses it less often.
  • Support Party Member: She's part of the Intelligence group alongside Kiriha and Clan. Her specialty is in data gathering, which is essential to Kiriha's strategies,and coordination and management of goods, personnel, and information.
  • Tears of Joy: She sheds these after knowing that Koutarou's the Blue Knight.
  • Weak, but Skilled: Eventually settles into this niche once she trades in her heavy sword for weaker but more versatile Laser Blades.
  • Yandere: Very downplayed and Played for Laughs. She can share Kotaro with anyone, except rhinocerous beetles. Seeing even one of them can turn her to this trope (to beetles anyway).
  • You Gotta Have Blue Hair: She has blue hair.

    Harumi Sakuraba 

Harumi Sakuraba

Voiced by: Megumi Takamoto

The well-mannered president of the school knitting club, and the only member other than Koutarou.

  • Almost Kiss: Gives one to Koutarou while half-awake in Volume 30 (It Makes Sense in Context). She's very embarrassed by it.
  • Can't Stay Normal: Alaia note  warns her that if she chooses to continue with what she is doing to support Koutarou and the Invaders she will never have a normal life again. She's just fine with that.
  • Cherry Blossom Girl: Sakuraba, being an Ill Girl Yamato Nadeshiko, is the girl Koutarou is most obviously attracted to at the beginning and the reincarnation of the legendary romantic heroine of the Holy Forthorthe Empire.
  • Club President: She's the president of the knitting club and its only member until Koutarou joined.
  • Dude Magnet: Several male students confess to her and she gets many fanboys after the Blue Knight play.
  • Ill Girl: Downplayed early on as it mostly means she isn't very athletic and needs to go to the hospital for regular checkups.
    • Becomes more severe in Volumes 23-26 because of the side effect of being the Living Battery for the legendary sword of the Forthorthe empire, Signaltin.
    • It's later revealed that the reason she's this is because half of Alaia's soul is in Signaltin while the other half is in Harumi, which is similar to Alaia's experience after releasing Signaltin. She later gets the other half and can probably live with a healthy body.
  • Irony: Alaia wished a normal life so she can love Koutarou as an equal and without politics being involved (i.e. Harumi's life), meanwhile Harumi wants to be more like Alaia due to her closeness with Koutarou.
  • Lady and Knight: Many compare her relationship with Koutarou to a noble princess and her brave knight. It makes sense since Harumi is the Silver Princess reincarnated and Koutarou is the Blue Knight who served the princess after he traveled back in time.
  • Magical Incantation: In contrast to Folsarian magic (where casters simply state the name of the spell), her Ancient Forthortian spells require her to first chant pleas for spirits to come to her aid.
  • Nice Girl: She's so nice that there's not a single drop of bad blood in her.
  • Old Money: It's implied that her families' rich, since they own a summer house near the beach and the Cosplay Club president states this.
  • Past-Life Memories: Of being Alaia up to when Koutarou and Signatin leave.
  • Power Dyes Your Hair: When she uses the Silver Princess' power, her hair turns to silver.
  • Powered Armor: In volume 15, Clan invents the PAF (Power Assistance Field) to help Harumi conserve her stamina - a belt-mounted device which uses a weak skintight forcefield to assist the wearer's movement. While no match for combat-grade equipment, it makes Harumi significantly stronger and offers protection from harsh environments (even being usable as a spacesuit), and its low power consumption means she can use it all day.
  • Reincarnation: She is Alaia's wish to be with Koutarou again. Even Clan, who's a scientist from a futuristic planet, can't help but think this is true
  • Reincarnation Romance: She's the reincarnation of Alaia, who fell in love with the Blue Knight, the time traveled Koutarou.
  • Rescue Romance: The more mundane type. She develops feelings when Koutarou saves her from a student who tries to force her to date him and saves the Knitting society by joining it, which could've been disbanded since she was the only member. Being Alaia's reincarnation who was also saved by Koutarou helps.
  • Single Woman Seeks Good Man: It's Koutarou's Nice Guy attitude that made her fall for him.
  • Squishy Wizard: She uses Ancient Forthorthe magic but lacks physical prowess. Justified since she has a chronic disease and her body’s not physically strong.
  • Sempai/Kohai: She's Koutarou's upperclassman by one year.
  • Single-Target Sexuality: She doesn't pay attention to all the other boys confessing to her because she only loves Koutarou. Unknowingly to her, she has loved him since her past life as Alaia.
  • Supernatural Is Purple: She has violet eyes, hinting she isn't a normal human because she's the reincarnation of a legendary alien princess and has special powers thanks to it.
  • Took a Level in Badass: After accessing Alaia's power, she can use Ancient Forthorthe magic.
  • Unwitting Muggle Friend: Koutarou hides his daily life of weirdness from her ...until Volume 12.
  • Yamato Nadeshiko: She's a kind, well-mannered and docile Japanese girl, but she's no pushover and can share bits of wisdom from time to time. She also has literally undying devotion to the man she loves.

    Shizuka Kasagi 

Shizuka Kasagi

Voiced by: Aya Suzaki

The young landlady of Corona House as well as Koutarou's classmate.

  • Badass Normal: Even without using Alunaya’s power, she’s still a master martial artist that can kick your ass if you ever make her angry.
  • Bare-Fisted Monk: Has been training in karate as a way to deal with the loss of her parents.
  • Berserk Button: Any time damage is done to Room 106 or any other part of her building, someone is getting a beatdown. Seriously, don't try to damage it.
  • Beware the Nice Ones: She's a nice girl, but don’t try to mess with her.
  • Birds of a Feather: She and Koutaro have very similar circumstances. They had both lost family, fought against outsiders to protect their place but are now trying to protect them. They're also given powers by others but outside having a combat talent note , they're still normal everyday Earthlings.
  • The Big Guy: She's physically the strongest of the team. And she gets even stronger with Alunaya's help
  • Body and Host: On the good variety. She's the current host of Alunaya, the dragon that Kotaro saved 2000 years ago.
  • Can't Stay Normal: Alunaya asks her if she wants to be stronger, he can grant her (his) strength, but she’ll give up her normal life. She accepts, since Koutaro and the others aren’t normal anyway, so she can be strong like them and they’ll still accept her.
  • The Gadfly: Very low key, third biggest tease after Kiriha and Sanae.
  • Locked Out of the Loop: She didn't know Alunaya was inside her after the reveal to Koutarou in volume 13. Though she finds out the next volume.
  • Partial Transformation: As a result of the above hosting
  • Tomboyish Ponytail: Downplayed since she isn't actually a tomboy, but she is a martial artist and physically the strongest out of the protagonists.
  • Weight Woe: The more of Alunaya's power she depletes, the heavier she becomesnote . Even knowing it's not really her weight, it still makes her uncomfortable.

    Princess Clariossa Daora Forthorthe 

Clariossa Daora Forthorthe

Voiced by: Yukari Tamura

The princess from the Schweiger family, second princess of Forthorthe and Theia's rival

  • Because You Were Nice to Me: According to her, Koutarou’s one of the few who truly understands her and despite teasing her, he cares a lot for her.
  • Chainsaw Grip BFG: Her most commonly-used weapon is one of these, in contrast to Theia's (which tend to have conventional grips or float independently).
  • Character Development: After travelling with Alaia, she realizes how immature she was and starts working to try and become an empress similar or better than her.
  • Fire-Forged Friends: With Koutarou as a result of their adventures in the past of Forthorthe
  • Forgets to Eat: Prone to losing herself in her research and skipping proper meals. According to Koutarou she has very little knowledge of food in general.
  • Gadgeteer Genius: In her introduction she constructs a Wave-Motion Gun out of Earth parts so that it can't implicate her when she attacks Theia. After her Heel–Face Turn she invents a handful of other gadgets, including Harumi's Power Assistance Field.
  • Heel–Face Turn: She later befriends Koutaro after both of them traveled back to the past. Later on, she befriends the girls of Room 106, without them holding any grudge
  • In-Series Nickname: "Clan".
  • Our Weapons Will Be Boxy In The Future: Played with. She wields a blocky-looking BFG more advanced than anything on Earth, but it was intentionally built from only Earth parts, with most Forthortian weapons being far more sleek.
  • Playful Hacker: Thanks to being a Gadgeteer Genius, hacking is a secondary ability to her.
  • The Rival: To Theia. Clan is from the Schwieger family which is philosophically and politically opposed to the Mastir family from which Theia and her mother come. As preference for selecting the next Empress of Forthorthe is based on the order in which the eligible Princesses complete their qualification trials. Clan of course shows up in hopes of disrupting Theia's trial while she waits for the conditions necessary to finish her own. They later have a more friendly term.
  • Screw This, I'm Outta Here!: When she was still trying to kill Koutarou, she encounters Alaia-possessed Harumi protecting them. And facing an unknown enemy note  that's starting a counterattack, she retreats until she finds another opportunity
  • Stealth Expert: Her ship Hazy Moon boasts cutting-edge stealth technology of her own design, allowing it to perform missions which Theia's Blue Knight can't.
  • Super Wrist-Gadget: Wears one similar to Theia's.
  • Tsundere: She fills this role once Theia has grown out of it herself.
  • You Gotta Have Blue Hair: She has pink hair.

    Maki Aika (Dark Navy) 

Maki Aika

Voiced by: Kito Akemi

A Magical Girl affiliated with Darkness Rainbow, and an adversary of Yurika's.

  • Adorkable: She lacks proper social skills, making some of her moments adorable.
  • Broken Bird: Maki became apprenticed to the previous Darkness Navy when she (Maya) bought her as a slave when she was a child. That is probably one of the LEAST bad memories that Maki has of growing up.
  • Dark Magical Girl: She's a Magical Girl affiliated with Darkness Rainbow.
  • Innocent Fanservice Girl: Not apparent in the anime, but established in the novels that she has absolutely no inhibitions about stripping in front of Koutarou. So far, everyone has successfully stopped her from actually undressing and she's only tried when some one else has said something to make her think it's what she's supposed to do right that moment.
  • Heel–Face Turn: She later leaves the Darkness Rainbow, and changes side to Room 106/Satomi Knights
  • Insecure Love Interest: Most apparent compared to all the girls. She lack confidence on herself and doesn't want Koutarou to see the (both figurative and literal) scars of her past. He snaps her out of this.
  • Laser Blade: A magical version; she can make one at the top of her staff.
  • Mind Manipulation: Her specialty in magic, along with being a Master of Illusion.
  • Rescue Romance: She starts developing feelings for Koutarou after he saves her from almost dying from a demon.
  • Smoke Out: She disappears into a cloud of smoke a couple of times to escape from battles she's losing.
  • What Is This Feeling?: When she starts falling for Koutarou. She first though it was the effect of their contract, but even after severing it, she still has it. It’s clear that she fell for him.


Nalfa Laren

Voiced by: Sumi Shimamoto

The creator of the universe and "The first and last invader". Known on Forthorthe as the Goddess of Dawn, creator of the holy sword Signaltin. Under the name Oohime, she is also enshrined as a creation goddess by the People of the Earth, and as a sun goddess by the priests of Higashihongan Shrine.

See the Forthorthe section for tropes related to her mortal guise.

  • Divine Date: The goddess who created the universe is in love with a high school boy.
  • First Girl Wins: Literally the first girl in the Universe and the whole point of the invasions is the hope that Koutarou will fall in love with 'all' of her. Which he does.
  • Hot Goddess: She's one pretty goddess, that's for sure.
  • I Will Wait for You: Up to Eleven. She waited for eons for the day she could meet Koutarou in his time period.
  • Literal Split Personality: She made the invaders and each represent a part of her, which is why when they (or at least two) fuse, they end up creating her.
  • The Maker: She created the universe from nothingness at the beginning of time.
  • Mayfly–December Romance: Older than the universe and in love with a 16-year-old boy.
  • Meaningful Name: In Forthorthian, Nalfa means "before dawn" and Laren means "rainbow", together meaning "the rainbow in the sky before dawn"''. She has a rainbow theme and is the creator of the universe.
  • Multicolored Hair: She has rainbow-colored hair.
  • Physical Goddess: She's the creator deity with the form of a young girl.
  • Punny Name: Her English name in acronym is GoD.
  • Rainbow Motif: She's associated with the rainbow because she's the amalgamation of all the heroines.
  • Time Abyss: She's older than the universe itself.
  • Walking Spoiler: Everything about her character is a spoiler of the biggest revelations in the light novels.


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