The Token Mini-Moe of Fate/stay night, and the protagonist in this continuity. While living peacefully with her family, a magic stick named Kaleido Ruby chose her as its master. Her job as a Magical Girl is to capture a number of powerful cards.
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.
Expy: Here, she's more or less Sakura Kinomoto updated for the new tens. Her magical girl costume is pink, she has a very cool older brother, her mother is an ingenue, and her aloof rival is significantly better in gathering the cards. The only thing missing is a Tomoyo to record her exploits.
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.
Deconstructed. 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 come 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.
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.
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.
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.
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.
But Not Too Foreign: It's more than hinted that this version of Rin has a foreign mother, and what's more doesn't share the same mother as Sakura in the mainline Fate/Stay Night timeline.
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?!?
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 Zeltrech 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 Normal: Well, "Normal" still means she's a mage, but she was the one who beat the Archer and Lancer cards without outside assistance.
The Berserker: She is compared to THE Berserker in series. She is also compared to classical berserkers when she charges through Gilgamesh's Storm of Blades and rips his heart out.
Cardboard Box Home: Lives under one after getting her assets seized. Doesn't seem to bother her though.
Cloud Cuckoo Lander: Lets just say that what passes for common sense for this version of Bazett doesn't apply for everyone else.
Illya, Miyu, and Kuro: Something seems to be wrong with this person!
voiced by: Haruhi Terada (Sella) and Miho Miyagawa (Leysritt)
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.
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.
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.
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.
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.
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.
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.
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 is implied to be a sniper.
Head of the Ainsworth clan; the "true enemy" according to Gil.
Affably Evil / Faux Affably Evil: Very hard to pin down. He seems 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.
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, likely from overusing whatever magic he can use.There likely is more to him, due to the fact that he is still alive and held captive by people from whom he freed Miyu and for whom it would be a sensible choice to kill instead of merely imprisoning him.
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.
Only One Name: We don't know his name because his sister used a name given to her by Luvia. We only know that it isn't likely to be "Emiya".
Red-Headed Hero: Currently held captive in a dungeon, but he is the one who went on a one-man crusade to free his sister from the Ainsworths in the past (which is how he got captured). And his hair are still mostly red.
Satellite Character: As of now, his only function in the story is to give the heroes information on Miyu's location and beg them to save her. And the only thing we know about his past is that he was the one to free Miyu originally.