The Token Mini-Moe of Fate/stay night, and the protagonist in this continuity. While living peacefully with her family, a magic stick named Magical Ruby chose her as its master. Her job as a Magical Girl is to capture a number of powerful cards.
Afraid of Their Own Strength: Linked with her I Just Want to Be Normal wish in the first season. Illya remembers that it was her who defeated Saber Alter after she annihilated Assassin. When she realized that she almost killed Luvia, Rin and Miyu too, she immediately teleports home (to everyone's surprise) and tries to quit being a magical girl the next day. Her mother snaps her out of her depression.
Dangerous Forbidden Technique: Her Zwei form. By combining the two Kaleidosticks, she can fight on-par with an unleashed Gilgamesh. However her internal organs take damage when she uses them as pseudo magic circuits to increase her power, prompting Ruby to forbid her from such a technique when she mentions it.
Her Zwei form has her wield Magical Ruby and Magical Sapphire at the same time.
Fetish: Turns out her reasoning takes a massive hit once she is around a Meido. Hilarious results follow.
Genre Savvy: As a Magical Girl fan, she can see the complications and cliches in her card hunting activities coming from afar.
The first thing she does is suspect Ruby. Until she mentioned the power to control love, she didn't actually care about the prospects of being a Magical Girl. She still got dragged into it unwilling though.
Saber: Appears to be a stripped-down version of Saber Lily. Only her gauntlets and greaves are armored, the chest plate is missing.
I Just Want to Be Normal: She was dragged into Magical Girl shenaningans because she happened to watch Rin and Luvia fighting. This earns her a rather difficult mentor and a magical stick that sends her to chase down magical cards. She wasn't thrilled. It's also deconstructed later on; the logical conclusion of her returning to normal would be as if she never met Rin, Miyu, Luvia, and Kuro, rendering everything that have happened meaningless. Also, Kuro will disappear if it comes true— naturally, she violently rejects this desire of Illya. The whole thing sounds like a Shout-Out to (the manga version of) Cardcaptor Sakurain which Sakura's failure to pass Yue's trial will erase absolutely every memory pertaining to gathering the cards.
Underwear of Power: Her Archer and Lancer Install, exposing parts of legs in the latter, but fully in the former.
Unskilled, but Strong: When compared to Luvia and Rin. She also gets a large amount of prana from being the Cancelled Grail, which manifests as a Superpowered Evil Side. However, once Kuro splits from her, she becomes noticeably weaker.
Weak, but Skilled: After Kuro manifests herself at the beginning of 2wei, Illya's base form become significantly weaker. Additionally, unlike Miyu, she can't use Installs until Drei, locking her into her standard trance. To overcome this weakness, she uses her creativity, firing her magical shots as blades and forming smaller, but sturdier geometric shields. With the exception of Gilgamesh, all of her fights in Zwei are won through teamwork and her intelligent usage of the Cards.
A girl that Sapphire contracted when she abandoned Luvia, she quite literally conveniently appeared just when the stick required a person to contract with. Despite her past circumstances prior to meeting Sapphire being a massive question mark, Luvia just rolls with the situation, and takes Miyu into her "service", going as far as giving her the Edelfelt surname. She lives in the Edelfelt mansion (just beside Illya's house), and works for Luvia as a maid.Unlike Illya, Miyu is extremely gifted in academics and sports, but has a massive problem interacting with other girls her age. She also has a very jaded outlook on the world, and shows little of the wonder a girl her age should have.
The Ace: She excels at mathematics, cooking, athletics and can draw based on principles like cubism, which are far beyond the reach of any normal elementary school student. Ironically, her expert knowledge of physics gives her a disadvantage with respect to being a magical girl.
Badass in Distress: Her captivity by the Ainsworths and being trapped in New Fuyuki City kickstarts the plot of 3rei.
Broken Bird: Courtesy of being her universe's Holy Grail, being held captive and having her captors wound her because her blood has magic properties, and her brother being held captive and tortured by the same people who keep her prisoner.
Brutally Honest: Miyu is rather upfront about the fact she doesn't bother to remember any of Illya's other friends names, even after she had been hanging out with them for a month or two!
No Social Skills: When it seems Miyu is absolutely better then Illya in everything, Miyu completely sucks at interacting with others of her age. Justified by her being kept captive by the Ainsworths because of her power as her universe's Holy Grail, and thus not being able to interact with other children.
Not Quite Flight: Miyu can't actually fly because she has mental hangups properly picturing it. Instead, she solidifies magical energy to momentarily create footholds mid-air that she can repeatedly jump off of.
Psychosomatic Superpower Outage: She can't fly not because of her knowledge of physics, but because she is too broken to imagine herself capable of flying.
Illya's cousin, recently transferred in from Germany. Or at least, that's the story Illya (and later on her mom Irisviel) tells everyone. In truth she's a sort of a magical clone created by accident when Illya was helping Rin in stabilizing the dragon pulse beneath Fuyuki city, with the core of her being based around the Archer card.Her personality however comes from the supressed memories of Illya's original purpose as the Holy Grail conduit, and she's rather bitter at the fact that Illya's been able to live a normal life ignorant of this.
A pair of sentient magical artifacts created by Zeltrech, Ruby and Sapphire were initially loaned to Rin and Luvia to accomplish the card gathering mission. They are tools of immense power, capable of creating magical effects that would likely kill a normal wizard due to excessive mana use... Only if they feel like it.They eventually grew tired of the near-constant squabbling that the two female mages did, and went on their way to find more... appropriate masters. Although technically made at the same time, Ruby sees herself as the older sister, and is treated that way by Sapphire.
Clingy MacGuffin: They will force Illya and Miyu to magical girls until such time as they feel like annulling the contract. And no one else can do anything to change that.
Ruby's former master, and a mage-in-study at the Tower of London. In the manga she gets roped into retrieving the cards from Fuyuki City after she gets into a brawl with Luvia that destroyed a huge chunk of the school, while in the anime she volunteers when she hears that, if she succeeds, she'd be taken under Zeltrech's wing as an apprentice.While being typically abrasive and possessing a hair-trigger temper (especially with regards to Luvia), Rin shows real concern to Illya, and understands that the responsibilities thrust on the girl might be too much for a girl her age to bear.
Brainwashed and Crazy: In 3rei, she and Luvia have been subjected to the Ainsworths' "doll-ification" thanks to Angelica's powers.
Butt Monkey: Alongside Luvia. Most frequently during battles.
Smart People Wear Glasses: Rin's 'explain things' glasses make a triumphant return when Rin and co are having a strategy meeting, She even dons them in her maid outfit.
Tsundere: Rin is Rin, it doesn't matter in which universe. That said, this incarnation shows more of her dere side than Rin normally does, as with her smiling and praising Illya for her showing in her first battle.
Sapphire's former master, and like Rin, a mage-in-training in Tower of London facility. Despite being ostensibly on the same side, the fact that Luvia utterly loathes Rin makes her treat their task as a competition with the Japanese mage rather than a cooperative mission. She's proud, snooty, and very VERY rich, all things that infuriate Rin to no end. However underneath all this she does keep a sensitive side, though it's likely no one but Miyu has been able to witness it.In a bit of irony, in the mainline F/SN, she and Rin are distant cousins, but with the changes to the nature of the Grail War in Prisma Illya, it begs to be seen whether this is still the case.
Big Fancy House: And one that Sella observed was built from the ground up over the course of one day.
Illya: Weren't there a row of normal houses here this morning?!?
Brainwashed and Crazy: In 3rei. Much like Rin, Luvia mindlessly serves the Ainsworths as a maid through Angelica's manipulations.
Butt Monkey: Alongside Rin. Most frequently during battles.
The strongest enforcer of the Mage Association, and the original agent assigned to retrieve the cards, before Zelretch intervened. Despite being a normal human, she possesses a strength rivaling that of the cards' manifested Heroic Spirits.She appears midway into 2wei, trying to take back the cards that both Rin and Luvia had collected at that point. It is during this encounter that she reveals just how powerful she is, as she takes out most of the main cast very handily. It is only after the revelation that there's an eight card slumbering in the city that she is forced to retreat, and eventually ally with Illya and her friends.
Badass: Completely trounces all the main characters with little effort.
Counter Attack: Her Mystic Code and Noble Phantasm Fragarach. It works on a similar principle as Gae Bolg, but is defensive in nature, making it less effective against an enemy who isn't using their strongest attack. When used against Rider!Miyu's Bellerophon it strikes the heart of the Pegasus, instead of the attacker, the reason being that Miyu is only channelling Rider instead of being an actual Heroic Spirit.
Curb-Stomp Battle: She's first introduced defeating Luvia and her butler August with ease, and when Illya and Kuro show up to investigate what's happening, Bazett gives them a similar beating. It takes Miyu riding Bellerophon to at least even the playing field, and thena carefully planned Master-Slave binding spell, as well as the revelation of a hidden 8th card, to convince her to temporarily call a truce.
Enemy Mine: Teams up with Team Illya in 3rei, where they have to rescue Miyu in the alternate world ruled by the Ainsworths.
Fights Like a Normal: Unlike traditional mages like Luvia or Rin, the most magecraft we see from Bazett is her empowering herself with runes and utilizing her Mystic Code. Most of her fights are won by punching out the opposition. Despite that, she was the one who beat the Archer and Lancer cards without outside assistance.
The Juggernaut: Just about every opponent she's faced (even Gilgamesh!) has been unable to do jack against her unstoppable fighting style. That is, until Darius enters the scene and flattens her, Kuro and Illya without much effort.
Synchronization: Gets subjected to the same Master-Slave binding spell that Rin used on Kuro to tie her to Illya.Though she claims it doesn't stop her — she is still ready to just beat her half to death, while her own stamina would keep her conscious. Later, she found a mage who can cancel such magic and had the curse removed.
Voiced by: Haruhi Terada (Sella) and Miho Miyagawa (Leysritt) (Japanese), Beth Lazarou (Sella) and Meaghan Avocato (Leysritt) (English)
The von Einzbern family maids, who accompanied their mistress Irisviel to Japan after she married Kiritsugu. They are also sisters, with Sella being the more serious and responsible of the pair, while Leysritt is content to just lounge about the house after she does her daily duties.As servants of the von Einzberns, they know perfectly well about Illya's role in the aborted Grail War ritual, and Sella in particular is constantly worried that Illya has secretly gotten herself in some sort of trouble. Her concern is VERY merited.
A-Cup Angst: Sella is ...sensitive ...about how, despite being sisters, Leys is much more well-endowed than her.
Aren't You Going to Ravish Me?: When Iri forces Sella to dress provocatively and give Shirou "do you want dinner, bath, or me?" speech, henaturally chooses "dinner". Sella proceeds to beat him up for that, calling him "good for nothing".
Berserk Button: There are several sure-fire ways to tick off Sella: comment on her weight, comment on her lack of endowments, and pre-emptively finish her housework despite it being her turn to do so.
Meido: Though in this incarnation it's not apparent, due to the fact that they don't use their uniforms anymore.
Illya's mother, and the de-facto head of the von Einzbern family. Iriviel is often away from home, accompanying her husband Kiritsugu in his "work" around the world, and leaves the care of the house to her maids. Unlike Kiritsugu, Iri makes it a point to drop by and check on the family every so often.
Hidden Depths: Iri, while well-meaning, is generally seen by both her children as flighty, spontaenous, and impulsive. As her arrival in the first "season" and 2wei shows however, Iri is very perceptive and is often on-the-button with regards to Illya's problems.
Impoverished Patrician: It's easy to forget that, in the mainline Fate series, the von Einzberns were considered both nobility and a pre-eminent, if secretive, Mage family. Here though? Your typical middle-class family, with Iri herself as a supportive wife. Irisviel isn't in the least bothered by this though... maybe. She does make fun of the Edelfelt mansion getting demolished in 2wei for example.
Last of Her Kind: As she reveals in 2wei, Iri and Illya are the last of the von Einzberns left alive.
Moment Killer: A walking example. Illya even notes the atmosphere is ruined whenever Iri appears.
Those Four Girls: Their main purpose is to support the fact that Illya in Prisma Illya has had a happy and normal life.
You Gotta Have Blue Hair: Despite being Japanese, they don't exactly have naturally-occuring hair colors. Nanaki's is pink for example, Suzuka's is a dark teal, and Mimi's is an almost black dark green. Tatsuko's strawberry blonde can happen in real-life, but isn't endemic to Japanese in general.
The quiet one and so-called honor student of the group. Despite her reputation as a goody two-shoes, her secret hobby is writing homoerotic novels, the knowledge of which Suzuka quickly takes advantage of. This in turn breaks Mimi's perception on relationships, to the point that she considers yuri or BL pairings as perfectly normal in real life.Compared to her friends, she's the only one who's an older sibling rather than a younger one.
Running Gag: Mimi has zero presence, and people like Ruby or Miyu tend to forget about her very easily.
Voiced by: Mariya Ise (Japanese), Juliet Simmons (English)
The most "normal" among Illya's friends, and seems to straddle a midpoint between Tatsuko's lunacy and Mimi's good-girl role. Despite this she can be as goofy as the rest of them. Her older sister Nanami is the schoolmate of Illya's older brother Shirou.
Big Sister Worship: Adores her older sister, which is why she's noticeably distressed when said sister is traumatized by a bad encounter with her "twintailed" and "gold drilled" schoolmates (Rin and Luvia, respectively).
Despite bing the most reasonable-looking member of Illya's friends, Suzuka is as much a goofball is the rest of them, but she hides this fact really really well. This class rep demeanour also hides behind it a raging fujoshi, but thankfully she keeps these urges in check while at school.
A woman whose eyes covered by a visor who wields a chained spike that can be extended and retracted. She is the first Card faced by Illya and Rin.Her only notable ability is her high speed, allowing her to dodge Illya's attacks.
Fragile Speedster: She has no armor, and must rely on her speed to avoid getting hit.
Nonindicative Name: Her class card is Rider, but she spends her entire battle on-foot. She is never actually shown riding anything.
Wave Motion Gun: Bellerophon can be fired off as one. She attempts to use it before being pierced in the heart by Gae Bolg.
A mage who wears a hooded cape and carries a staff. She is the second Card fought by Illya's group.She can fire massive barrages of magical artillery, in addition to several other magic-based attacks.
The manifestation of the Saber Card. She is clad in black armor and carries a black sword. She shares a plane with Caster, and is fought immediately by Illya's party after the former is defeated.She is covered within a dense mist of mana that protects her from magical attacks. Her sword is capable of firing waves of black energy.
Anti-Magic: She has very resistance to magic, owing to her class. She is also covered by a mana barrier that deflects spells.
The fourth Card fought by Illya's group. The Assassin Card is split up between many different individual Assassins, but each share the same skull-shaped mask.Other than its overwhelming numbers and its usage of poisoned darts, the Assassin Card doesn't seem to have any significant abilities.
Self-Duplication: He can create duplicates of himself through his Noble Phantasm. Illya gains the same ability when she installs the Assassin Card.
Zerg Rush: Attacks with dozens of weak "copies" of itself.
The manifestation of the Berserker Card and the last Card fought. He is a hulking man who fights without a weapon.His Noble Phantasm grants him the power to resurrect and restore his injuries after being killed, gaining immunity to what killed him in the process.
Lightning Bruiser: He's the strongest Heroic Spirit, as well as one of the fastest. Although he's still insane, he is still extremely dangerous.
The Unfought: He's killed off-screen by Bazett before the series even begins.
The Eighth Card (SPOILER)
The King of Heroes... not quite as you may remember him from previous Fate installments. He initially shows up as yet another corrupted servant seeking the Holy Grail... only to be defeated by Illya and left in a child form.He becomes one of Illya's main allies in 3rei, seemingly out of annoyance for the Ainsworth's stealing most of his treasury.His Class Card is Archer.
All Your Powers Combined: As always, he brings Gate of Babylon with him. And with it, every Noble Phantasm that originated on Gaia.
Badass: He's the same ol' Gilgamesh from Fate/stay night, although because his madness cancels out his arrogance, he gets to show off extreme displays of power throughout his fights.
BFS: He holds a MASSIVE sword in his vault. Illya manages to breaks it and it remains broken after its second appearance. Naturally, as he owns every weapon ever comprehended by man and then some, he has a figuratively infinite number of giant swords.
Earth-Shattering Kaboom: Ea, the only known Anti-World Noble Phantasm with which he blows up the Mirror World. Keep in mind that it's world as in the concept and not specifically a planet buster (though it is perfectly capable of doing so).
Easily Forgiven: Thanks to his A+ Charisma, he convinces Illya to forgive him for trying to kill them all.
Evil Laugh: Seemingly the one remnant of his personality.
Walking Spoiler: Not only does he show up very late into 2wei as the final opponent, but he also becomes a protagonist in 3drei, accompanying Illya in her quest to save Miyu from the Ainsworths.
What the Hell, Hero?: Subverted. It looks like he's calling Illya out on her carelessness and willingness to lead people into a suicidal quest...but it turns out he's listing the reasons why it sounds fun.
Worthy Opponent: Decides that Illya is worthy of facing Enuma Elish when she combines the two wands and risks her own death for her friends.
New Fuyuki City (SPOILERS)
A mysterious girl from Miyu's world, she seeks to defeat the Ainsworth family, but remembers nothing else.
The proprietor of a ramen shop seemingly specializing in hellishly spicy Mapo tofu, and the only store seemingly still open in the mostly-abandoned Fuyuki city. Definitely knows more than he first lets on about the circumstances surrounding the city's abandonment.
Chekhov's Gunman: Its only a matter of time before he is more involved in the plot.
Space Master: The Ainsworth family's magecraft is Flash Air, a type of displacement magecraft. It can be used something as simple as grabbing things from a distance to something like morphing a mountain into a castle and hiding massive objects in plain sight.
One of the Ainsworths' dolls, She installed Gilgamesh's Archer card, granting her his powers. She and Beatrice were the ones sent to retrieve Miyu and guard The Ainsworth estate.
Boobs of Steel: Has the largest bust of any female shown in the manga and is able to channel Gilgamesh's power, even fighting the latter to a standstill for the majority of their duel.
Dark Action Girl: She's a shining example in that she's ruthless and very straight to the point, making her extremely efficient compared to the rest of the cast.
The Heavy: She's actually responsible for much of the game-changing plot twists in 3rei, mainly due to her ability to extract souls from their original body and putting emotionless dummies instead, which she does to Illya, Rin and Luvia.
I Am Not Left-Handed: Invokes this midway through her fight against Gilgamesh when she claims she has not yet used her Card to its full potential. However, they are interrupted by Beatrice barging in with her own ''fight'' against Caster!Illya.
Storm of Blades: By installing Gilgamesh's Archer card on herself, she gains the hero's signature Gate of Babylon, allowing her to fire near-unlimited amounts of weapons at her opponents. Gilgamesh successfully gains some of his treasures back during his fight with Angelica.
One of the Ainswroth's dolls, She installed the Beserker card, granting her the power of Thor.
Beatrice: "N... Not that I really... missed you or anything!... Ohhhhhh! Julian-tan's tough guy act is so moeeeeee!"
Illya: "What the hell is she doing?"
Unknown Rival: Subversion. She absolutely hates the Archer!Emiya Card's wielder. The subversion is that its current holder, Kuro, is someone else entirely, and neither of them have met face to face. The only thing we know is, she's fought against the previous user, whom was implied to use it as a sniper.
Darius Ainsworth (Julian Ainsworth)
Head of the Ainsworth clan; the "true enemy" according to Gil. He seeks to use Miyu to complete his "legend" and save his Earth from a Angel Notes-esque apocalypse. He is in actuality Julian Ainsworth, Darius' son who took his father's place after Darius' untimely death.
An Ice Person: Is able to erect a massive ice dome to prevent Kuro and Bazett from interrupting his conversation with Illya. That is, until Tanaka shatters it with a powerful blast of heat.
Badass: From just his introductory fight, he's able to repel every attack thrown at him, be it Kuro and Bazett's strikes, or even Illya's Saber Install, and flattens everyone with just a single command.
Bare-Handed Blade Block: Performs one against Saber Install's Excalibur, with the excuse that it would hurt Erika if swung around recklessly.
Big Bad: He's the Head of the Ainsworth Family and the person responsible for the appearance of the servant cards earlier in the story and the handling Miyu as the alternate universe's Grail.
Dead Person Impersonation: After Illya strikes him with Rule Breaker, it's revealed that the actual Darius had died sometime before 3rei. The current Darius is actually his son Julian, using magic to impersonate his appearance.
Face Framed in Shadow: Used to great effect during his appearances just to show how sinister his character is.
Faux Affably Evil: At first he appears to genuinely care for Erika, and holds back Angelica and Beatrice from killing the cast, but at the same time he's totally unrepentant about his abuse of Miyu and was willing to kill Tanaka just for being someone he didn't know about. Then its revealed he regularly beats up Erika, and is generally the reason she is so ill adjusted she doesn't understand why Miyu would cry over Illya having her soul ripped out.
Final Boss Preview: Shows up to pick up Erika and show Team Illya exactly what kind of power they're trying to challenge.
Nightmare Face: Occasionally flares creepy expressions when interacting with Illya. Also has when he beats up Erika.
Visionary Villain: Apparently Darius wants to save the world, specifically making it so that humanity would survive the eventual depletion of Mana on Earth, the latter scenario suspiciously similar to the situation in Angel Notes. Hmm...
Miyu's elder brother. He went on a crusade against the Ainsworths on his own and sent Miyu to Illya's world to let her get away from them. He is currently kept captive in a dungeon in the Ainsworths' castle and very likely tortured. He looks just like Shirou from Illya's universe, but has a few strands of white hair and some brown patches of skin from overusing his Projection magecraft.
Alternate Self: He's the parallel version of Shirou Emiya, Illya's older brother in her reality.
Shirou: If you're willing to kill one person for the sake of the greater good then I'm willing to accept all the evil that comes with stopping you. Do you have enough resolve, champion of justice?
Badass in Distress: He is the one who freed Miyu from her captors in the past, which implies Badassery. And he is currently their prisoner, getting captured in the process of doing it. Later, Gilgamesh breaks him out.
BFS: The first two weapons he's shown projecting are Nine Lives and Ig-Alima.
Hero of Another Story: Before the story began, he took on the Ainsworths and managed to send Miyu to another universe. From the small details provided, he's held off or beaten Angelica before and he's used Unlimited Blade Works at least once. In one of 3rei's earlier fights, Beatrice recognizes the Archer Card's abilities while being sniped by Kuro, but whether or not it he was the user remains unknown.
Heroic RROD: While fighting Angelica, his heavy usage of Projection takes its toll after he tries and fails to invoke his reality marble, leaving him vulnerable to her Storm of Blades.
Red-Headed Hero: A red head on a one-man crusade to free his sister from the Ainsworths.
Satellite Character: Spends the first half of 3rei giving the heroes info on Miyu's location and being the cause of Miyu's original escape to Illya's world.