Ambiguous Disorder: Shirou, who doesn't seem to realize that Rin has feelings for him and consistently takes her at her word. This causes… a little friction. Being "distorted" (as in canon), this is unsurprising.
And I Must Scream: Medea lives up to her title of 'Witch of Betrayal', as her Master can attest...
The King of Rats smiled. "You are not the first to say that young girl. My master himself was also quite intrigued when he first realized that I am rather fond of the human race even though he did not create me as such." He raised the mace to the light in the room to get a better look at it. "When he asked me about it, I merely replied that I constantly work for the betterment of all rats, my master… and humans so long as the latter continue to make pizza of course."
Blasting It out of Their Hands: Rin does this to Louvre, shooting the Mace of Odo to multiple characters' surprise. Justified, as the mace is weak to anything non-magical.
"…I can't believe that actually worked…" Rin, Bazett, Shirou, and Waver muttered under their breaths in relief and or mild disbelief.
Boring Yet Practical: Assassin may not seem much. Caster does say that he doesn't have any impressive spells, and he really doesn't. He's boring because he's cold, efficient and does not fuck around. Since he uses modern weaponry, he's the only Servant who who can act during the day, and he can snipe anyone without suspicion on magic. And on defense, if anyone dares try to siege your base, his traps and skills ensure that they'll be SORELY defeated.
Cain and Abel: Ilya and Shirou met, the latter recognizing the former, and... it went poorly. Very poorly.
Chekhov's Gun: Shirou's inherited magic crest ends up being a Game Breaker against Louvre: Time magic, combined with the Origin Sword Maiya, equals a way to bind a vampire's personal timespace to the Gaian timeline, thus nullifying his pesky healing factor. I repeat: Shirou is now not only a major threat to magi all around, but it expands to magi-turned-Dead Apostles as well.
The Chessmaster: Aside from the usual Betrayer!Caster, Kotomine and Zouken, another player has suddenly come into light. Who? In an unusual move, it is Shirou. That's right, oblivious, Naïve Newcomer, Shirou. Thanks to his father's dreams, he's become one of the war's biggest power players. As a demonstration of how good he's gotten, he was able to make Kirei help him kill Zouken when the opportunity presented itself.
"I have A+ riding." Medusa replied. "It would be better if…" She stopped talking as an invisible blade's tip pointed at her chest. Despite being blind, she could see the cold protective look her partner had on her face at the mere thought of giving up her ride to someone else. It would most likely be the same one she would have if someone tried to take Pegasus from her. "… Back seat it is."
Cool Bike: Having learned from his father that Saber was good with a motorcycle in the 4th War, Shirou gets her one for the 5th. It's a custom upgraded, nitro boosted, heavily enchanted 1999 Suzuki Hayabusa that can do 350 km∕h (40 km∕h faster than the stock model) without using the nitro. She loves it.
Up to Eleven: The bike could have been even cooler, but the advanced enchantments require one of the standard five affinities to cast, which Shirou doesn't have. Who knows what will happen if he can get Rin or Sirius (Who have all five of the standard affinities) to further upgrade it?
The Suzuki Hayabusa was cool even before being enchanted. Why? Not only is the maximum speed higher than normal bikers can manage (prompting motorcycle producers in the entire world to put electronic limiters so that no other motorcycle can go over 300 km∕h, thus avoiding accidents when these monsters get into the hands of anyone who isn't a champion), but the bike is balanced, sleek and efficient, has good turning and excellent acceleration, and can be easily customized. As the author said, "if there was ANY series of motorcycles that had the potential to become a phantasmal existence at some point in the future, it was without any doubt the 1999 Hayabusa".
Cool Swords: The Origin Swords are Game Breaker material, to be blunt, to the point that Shirou could easily become The Dreaded for other Magi. Bazett has told him upfront that she'd kill him if he ever made her list before he could use them.
Natalia:,This sword actualizes the very concept of severing, if it so much as touch a living being with less than C-Rank magic resistance they will be instantaneously cut in half, same with inanimate object unless they are too big, otherwise it's simply an Absurdly Sharp Sword.
Maiya: Can bind things (note that the binding effect happens AFTER it makes a cut) including alterations, magic circuits and souls, improperly, effectively screwing over anything that can split itself apart, uses familiars, or adding something to their very core. A unique thing about Maiya is that if it causes an injury then the wound will bind itself improperly causing severe necrosis, as it works on a molecular level. So any injury cause by this blade can't be healed even with magic. Also thanks to Shirou's Time Crest, he can now bind Apostle's Timeline to the "normal" timeline, neutralizing their healing abilities.
Shirou:Sacrifice and save, blade of the cursed hero.Kiritsugu!
Of course, the biggest problem with the Origin Bullets? They are bullets, therefore they are limited ammunition. Here we have three monstrously powerful swords, and Shirou's Hyperspace Arsenal ensures that he has unlimited copies of EACH of them. In terms of being Anti-Magic, Shirou has truly surpassed his father in potential.
Curb-Stomp Battle: Marjatta, being a Rich Bitch Magus, assumes this when she goes to face Sakura in Chapter 25. It does turn out to be one, just not in her favor. She had to have her Servant save her from going through a worm bath and then Shirou showed up mad as hell armed with Gae Dearg, which is an Anti-Magic Spear.
Rider and Archer found themselves on the receiving end of one in chapter 28 when they ran into Assassin.
Dark Is Not Evil: Shirou's swords may turn out to be this. Sakura and Rider also count as well.
Dead Man Writing: Kiritsugu left behind letters to be read by Shirou once the the fifth Heaven's Feel goes into swing. Recent circumstances, however, led to Shirou discovering the letters early, although only one has revealed its contents.
Did You Just Scam The Queen?: It was more like bargaining, but Shirou managed to get a better deal on his end should he agree to being Lorelei's 'dog'. Sirius, Bazett, and Waver were not happy about this.
Didn't See That Coming: Waver Velvet's plan to rescue Sirius runs afoul when Louvre uses his newly-acquired weapon.
Shirou is offered both a scholarship under the Queen and the role of the 10th Dead Apostle Ancestor.
The Queen seeks to use him as a public enforcer for this reason and gave him a Noble Color for his advancements.
Because of Ore Scales, the sisters summoned two Medeas, one as a princess, and the other we know and love.
Shirou finding out that Assassin is neither Sasaki or one of the Hassan-i Sabbah. Or for that matter, any of the contenders finding out that Assassin uses modern weaponry.
Disc One Final Boss: Louvre serves as the antagonist of the pre-war arc, before biting the dust; he's later followed by Zouken Matou:.
Drama-Preserving Handicap: Not that Shirou needed one, but Chapter 24 has him take on the Command seals of Rider. The logic behind this had yet to be determined but it is most likely that Zouken wants to make Shirou weaker.
Another self-enforced example is leaving the Origin Sword Kiritsugu with Illya.
The Dreaded: Assassin is shaping up as one. He has pitiful physical stats, but he's so good at what he does that his battle with Rider and Archer was completely in his favor, with Rider and Archer only surviving because he let them go. Justified by him being Kiritsugu, an expert at killing powerful magi and Apostles using only basic human ability and preparation.
Shirou is shaping up to follow in his father's footsteps as "The Second Magus Killer" after killing Louvre. This is not necessarily a good thing.
Rin is technically doing this as well, since she's seeing Archer's life.
Enigmatic Minion: Assassin to Witch!Medea. Considering that it's Kiritsugu, this is a given
Entertainingly Wrong: Archer still thinks Rider is still Shinji's servant, not helped by Rider referring to her Master as a male. He's soon corrected when he talks about Shinji, and Rin "reminds" him that Shinji's dead for a couple years.
Likewise, Rin still thinks her Archer is the future version of the Shirou she knows, rather than an Alternate Universe version.
Exactly What It Says on the Tin: Assassin, whenever he uses magic, methodically says whatever he's going to do with the magic. If he wants a Firestorm at Twenty Meters, he'll say that he needs a nfirestorm at Twenty Meters. Just as efficient as the rest of what he does.
Rin, Luvia, and Princess!Medea all consider Archer's fate as a Counter Guardian to be this.
Finagle's Law: Shirou needed to recover from having Sakura's Command Seals transferred to him. Just as he was about to get some rest, the Edelfelt sisters chose to attack the Matou household. The ensuing battle drained his prana reserves up to the point his Apostle blood was coming to the fore.
Flaming Sword: Louvre's son has one with blue flame that drains od on contact.
Foregone Conclusion: Seeing as Kiritsugu saw all the routes, and the recent letter to Saber, it is possible that he wrote letters to Rin and Sakura as well.
All but confirmed — Chapter 37 starts off with his letter to Illya, fully explaining his actions, why he wasn't there for her, and then gently requesting that she take of her brother.
Chapter 33. Everything seems to be going great for Lancer and Princess!Caster in their fight against Assassin and Witch!Caster. Then the Witch uses a Voodoo Doll made from Bazett's severed legs to take control of her, forcing her to attack Luvia. Then Rin and EMIYA show up. EMIYA deploys Unlimited Blade Works and opts to kill everyone (which causes Rin to realize this is definitely not the Shirou she knows). Then Assassin's identity gets out, shocking EMIYA so much that he's unable to stop Kiritsugu from firing an Origin Bullet into the ground of Unlimited Blade Works.
Shirou's attack on Ryudou Temple not only failed to take out Witch!Medea or Assassin, it allowed her to steal Rider from him, giving her control of half the Servants in the War.
Though it can be hard to argue this as bad. As Witch!Medea only has one Command Seal left, and all three servants she has under her command want to kill her, not to mention Assassin hates her even more for using him as bait for his own daughter. The situation only gets worse for her when Shirou points this out, almost ensuring that every single one of those servants along with all her enemies will do whatever it takes to make sure she wastes that last seal.
Gallows Humor: Played with in chapter 15 when Bazett tells Shirou his dad would be turning in his grave over something he just said, so what does Shirou do? Projects all three Origin blades to see if they would roll over.
"The School Idol. The Foreign Beauty. The Overly Attached Underclassman. Shirou Emiya has wooed and claimed the heart of these trademarked stereotypes in the school he is at, and now with that Saber girl that's staying at his home as another Foreign Beauty, albeit less developed, it makes four, and I fear what he could do with you (Illya) who can easily represent the adorable little sister archetype," Taiga Fujimura stated seriously. "I so far have managed to remain immune from his wiles and not fill in the spot of the loving mature elder sister; however I am not so sure about that Bazett woman that sometimes comes over to visit." She paused before looking to the side in thought. "In fact, if those rumors about Ryudou-kun are true... oh dear lord if they are then he has a class president as well!"
I Am Not Left-Handed: Sakura's learned Reinforcement from Shirou and combined with her own mysteries pushed Marjatta back in close combat in chapter 25.
I Am Not My Father: Shirou insists it is not his intent to become like his father, despite how he has the potential to become the next Magus Killer.
Indirect Kiss: Rin didn't realize she was feeding a still-recovering Shirou using the same chopsticks she was eating with until Sakura pointed it out to her.
Instant Runes: Sirius' greatest Mystic Code, the Lebor na nUidre, the Book of the Dun Cow, is actually his skin, and allows him to instantly create runes on any part of his body, enabling him to give himself a wide range of abilities. It also allows him to make said runes on the outside world significantly faster than most magi. And also earned him a Sealing Designation, unfortunately. Fortunately, the milder variation. And he was prepared for the eventuality.
In Spite of a Nail: Rin still summons the same Archer using a piece of his cloth, Assassin is summoned by Witch!Medea and her master, and Ilya still tries to kill Shirou. However, the latter happen earlier than canon.
Chapter 26 has Witch!Medea relocate to the Ryudou Temple as her base of operations.
Internal Reveal: After Luvia confronted Shirou about Illya being his sister, Shirou is forced to reveal most of his goals for the Fifth War.
Jerkass Realization: Rin suffers two counts of this concerning Shirou. First is the identity of his Reality Marble, followed by the extent of how distorted he really was.
Laughing Mad: Rin after realizing that Archer is EMIYA, Archer wonders for a moment if Rin is insane.
Sakura in Chapter 25 has a subtle moment of this when the worms came and tried to subject Marjatta to what she went through.
Laser-Guided Karma: Marjatta constantly looked down on other people, viewing them as peasants and considering herself several times superior to them because of her bloodline; to the point she didn't care that families were dying because her Caster was draining Prana. It's also revealed she also killed a potential Master in cold blood before the War even started to get a second set of Command Seals. Caster'sbetrayal comes off more as her getting her just desserts than anything else...
Literal Split Personality: The Edefelt's sisters summoning of Medea resulted in this. Luvia has the nicer Princess incarnation, Marjatta the more cruel witch incarnation. This is reflected in their Noble Phantasms and skills.
Noodle Incident: The many experiments Rin once performed on Shirou that went awry.
Not Himself: Rin is starting to realize something is off about Archer, especially when she notices that he hasn't used Maiya, Natalia, or any of Shirou's elemental blades.
Not What It Looks Like: When Shirou is returning a prana-filled jewel to Rin, Taiga thinks Shirou got himself a new girlfriend.
Oh, Crap: While scouting the city, Assassin/Kiritsugu is spotted and recognized by Gilgamesh.
Original Character: Sirius McGinty, crafter of Mystic Codes, including Kiritsugu's Thompson Contender.
Chapter 18 introduces Marjatta Edelfelt, the younger sister of Luviagetta Edelfelt, who due to the Ore Scales aka Sisters characteristic of the Edelfelt clan is co-heir.
Papa Wolf: To say Kiritsugu was pissed off when Witch!Caster used him to mess with Shirou and Illya's heads would be a severe understatement. Any leeway she had with him is now long gone after that stunt.
Pyrrhic Victory: Chapters 35 and 36 has Caster survive Shirou's assault on her temple, force him to reveal several trumps, keep him from rescuing Marjatta, steal command of Rider from him, and use Assassin to physically and emotionally attack him and Illya after taking one of Berserker's lives. She came out of the whole thing worse off than anyone; having to recover from a mortal wound given to her by Shirou, her plans pushed back, her workshop damaged, all of Assassin's leeway towards her gone in place of blatant hostility, and having used up all but one of her command seals, which led to Shirou getting the last laugh after they called a cease fire when he pointed this out to everyone and said that he'd leave Bazette, Lancer, Rider, and Assassin at Ryudou Temple where she'd have to deal with them. Her position in the War is balancing on a knife's edge at this point, and she knows it.
And those are only the things that she knows about. On top of all that, her actions seems to have paved the way for a reconciliation between Shirou and Illya, meaning that she might soon be dealing with Saber and Berserker working together, she doesn't know that Luvia and Rin were spying on her and know just how precarious her situation is, and she's completely oblivious to the fact that she probably ticked off Merem when she killed the King of Rats. All in all, she lost more than anyone due to that battle, and stands to lose even more because of it.
Refuge in Audacity: Kirei's cover for the collateral damage of the battle at Matou's manor was chosen for three reasons: it adequately explained the home being burned to the ground and a large strip of road and a part of the woods being burned; it was so over the top people wouldn't be willing to think too hard about it; if Zouken survived, it would tick him off by declaring his home destroyed by a fool.
Secret Identity: When Shirou dons his holy shroud and masks his face, he turns into Emiya, the second Magus Killer and the Clocktower Queen's Silver Dog. This one is mostly out of the bag to any plot-relevant character by now, hilariously.
Another successful iteration would be Shirou's identity as the maybe-maybe-not 10th Apostle, the "Ash of Miracles". It's so secret even Shirou himself is not aware of it. Only Merem is.
Secret Identity Change Trick: Shirou dons the holy shroud as a ninja mask to hide his features. The cheesiness of which gets frequently lampshaded.
Archer tries to pull it in chapter 23 when Rin says he has to conceal his identity. Obviously, Rin points out this won't work. Archer is obviously rather miffed about everyone already knowing his tricks.
Small Role, Big Impact: Kiritsugu dies even sooner than in canon due to giving Shirou his Magic Circuits, but his actions here set the new plot entirely into swing. The impact really grows when he becomes Assassin.
The anti-Grail's team merely planned to have the Edelfelt's summon Medea to gain access to Rule Breaker, with Shirou quickly eliminating the summoned servant with Luvia none the wiser. Marjatta and the use of Ore Scales pretty much threw a wrench in the plans to minimize the Edelfelts' role in the war. One of the results from this was the destruction of the Matou residence.
The full scope of which gets pointed out in Chapter 36. Tripping on two broken landmines + Opportunity attack boost? Two A-ranked attacks, and one less life for Berserker. Ilya's face upon seeing her father dispatch her Servant was priceless.
Soul-Cutting Blade: Kiritsugu's intended function was to cripple a magus' Magic Circuits, but when that effect is reinforced by the curse of Angra Mainyu, the effect goes far further, all the way down to the very soul.
Weak, but Skilled: Assassin. He's a Glass Cannon. He barely has any direct combat experience, his stats are really weak, and he uses modern weaponry. But he's so goddamned skilled and such a tactical genius that if you DARE try to take him in his territory, all his powers will activate and his pea-shooters and cherry bombs become more powerful than most Noble Phantasms. Hell, if he gets a Sneak Attack on you, he can hits with enough strength to kill BERSERKER HERCULES. Archer and Rider double-teamed him on his territory and he didn't even get a scratch, and he defeated Lancer in FIVE seconds. Of course, this is Kiritsugu Emiya. Who else could he be?
Worthy Opponent: Gilgamesh still respects Iskander enough to spare Waver, in spite of his blatant attempts to have him killed.
She, Waver, and Sirius give him another one when they find out he spoke out against the queen for a deal compromise; which by all accounts was a stupid idea and would have gotten him killed on the spot if he wasn't so lucky.
Shirou gives one to Saber about her wish for the Grail. Unlike the disapproving speeches about her wish given by Iksander and Gilgamesh in Fate/Zero, she listens to this one, probably because his logic doesn't spit on her ideals as to the proper role of a king.
Luviagetta Edelfelt gave one to Shirou once she finds out about his advantages of the Grail War (years of preparation, the origin swords, etc) that threatened to completely destroy their friendship. He has very good reasonsfor hiding it though.
You Are Not Alone: Part of Rin's comforting speech when Shirou tries to make sense of receiving Mystic Code swords from Kiritsugu while being told to tone down his heroic-obsessed distortion.
Xanatos Speed Chess: Kotomine. Zouken. Betrayer!Caster. Shirou, Waver and Sirius. All of them are butting heads to claim the Grail or destroy it. And in the end, we have Spanner in the Works Assassin.
You Kill It, You Bought It: After killing Louvre, Shirou is offered his position as the tenth Dead Apostle Ancestor. Though he rejected the offer, later chapters imply that this didn't stop them from granting him the position anyway.