Path of the King by Neoalfa is a Fate/stay nightFan Fiction in response to the author's Fridge Logic of Emiya Shirou not actually having done anything that heroic for a guy whose life goal is to become a "Hero of Justice."Due to certain events, Shirou decides to take a more proactive approach about his dreams of helping people by fighting real-life crime, beginning his training years earlier than his canon counterpart under his father's guidance and with time becoming known as a Vigilante Man nicknamed the Archer. This is not an easy task even with the help of magic and between protecting his real identity, keeping himself under the notice of other magi and of course getting things done makes Shirou evolve into a different direction as person, hero and magus.After the initial chapters, the plot thickens when the kidnapping of a close friend of Tohsaka Rin brings her and the Archer's attention to each other at the same time that Emiya Shirou is helping Rin to find her. A criminal case that will prove to have more far-reaching consequences than expected.The story can be found in Fanfiction.nethere and it has a dedicated forum thread here (beware of spoilers).
This fic provides examples of the following tropes, in addition to those already present in the source material:
An Arm and a Leg: Medea vaporizes Jun's arms and legs, while only Jin's legs are vaporized.
Amnesia Missed A Spot: Even though Tohsaka made a very good job manipulating Detective Dojima's memories with hypnosis to make him forget about the events related to Guilford's mansionnote (for example, before deleting his memories she took the precaution of using his trance to ask him if anyone else knew what he was doing that night or if there was a writing or record that could help him to remember), he still noticed that something was amiss because the reading of his car's odometer indicated about 50 kilometers more than the expected number.
Being Watched: Like his canon counterpart, Shirou is very apt to notice when someone is watching him. Further developed after certain unrelated training made him sensitive enough to perceive a someone well-versed on the ways of magi who had him under surveillance.
Big Eater: Medea. According to Shirou, it must be a Servant thing.
Bruce Wayne Held Hostage: It happens to Rin when a group of five men assaulted her and a few of her friends from school. The gang wouldn't normally be a problem for her, but she is unable to find a way to deal with the situation bare handed while keeping all the girls safe or using magic and then wiping their memories afterwards.
Broken Masquerade: Medea undoes Dojima's Mental Manipulation, revealing the nature of magic and how over his head he was. Shirou comes clean to both him and Taiga later to forge an alliance.
Call Back: The mention of a couple of JASDF F-15s that went MIA during the events of Fate/Zero.
Chronic Hero Syndrome: Shirou, as per canon. In some cases, it works out very well, such as getting Caster's Undying Loyalty. In other cases it gets him into a death match with Ciel over the fate of recently undead Satsuki.
Didn't See That Coming: The Cheungs ran into a couple problems in trying to kill Shirou and Medea, as well as retrieve Guilford's Crest. One of the things they couldn't predict however, is Dojima coming to visit the Emiya household Crazy-Prepared.
Did They Just Have Sex?: Played with. After two honor students, Tohsaka Rin and Emiya Shirou, arrived to school one morning with identical (but not directly related) sleep-deprived looks, there was a rumor going around that this was the case.
Entertainingly Wrong: From the fact Archer was able to deal with some level of supernatural danger without too much trouble, Guilford correctly deduced Archer knew about magecraft beforehand, but he mistakenly assumed he wasn't a magus because he didn't resort to it in a life-or-death situation* (justified: magi in Nasuverse are usually too proud of their accomplishments above normal people to not use magic in such situation). From there his guesses went further off the mark by considering that Archer could be a retainer of the Second Owner of the land of Fuyuki (Tohsaka) because it'd be strange for someone like him to operate well within her territory without her permission and of course because Archer infiltrated his mansion just after Guilford kidnapped Rin.
Exact Words: When asked by Taiga why she was at Shirou's, Caster told her her actual story from the myth, omitting a few details.
Expy: The story borrows a few characters and their overall characterization from Persona 4. Most notably Dojima, Adachi and Yukiko.
Foreshadowing: In the How We Got Here prologue, Casterwasn't listed as one of the beings that Shirou didn't consider as his true opponent, while the likes of Gilgamesh, Kotomine, Zouken, and Hercules were. This would be the first hint that Shirou's relationship to Caster would be different than in canon.
Gut Feeling: The story posits that Issei has an innate sensibility to magic that make him perceive a magus' presence, becoming suspicious of them without really know why. This would be the reason why he can't get along with Rin and why he instantly approved Saber in canon.
Heroic Build: A side effect of Shirou's training regime. He goes out of his way to keep it hidden with baggy clothes and whatnot because it isn't consistent with what would be expected of someone with his known lifestyle. Unaware to him though, Taiga considered it her sisterly duty to advertise her protégé's good shape (with actual pictures no less) due to his lack of female friends, so this is pretty much Everybody Knew Already as far as a good portion of the Homurahara Gakuen's female student body is concerned.
Improvised Weapon: Yumizuka Satsuki flails a street lamp at Ciel the Executor in chapter 25.
Informed Ability: Averted. Unlike canon, Medea's Item Construction skill becomes a plot point in later chapters.
In Medias Res: The Action Prologue is chronologically set well within the Holy Grail War which, as of chapter 18, wasn't even properly started yet.
In Spite of a Nail: Even though one important event from canon's backstory didn't happen in Path of the King, namely the time when Sakura and Rin watched Shirou trying to perform a high jump during middle school (a.k.a. the BAR scene), both of them still became aware of him due to entirely different sets of circumstances. Sakura met Shirou not long after the end of the forth Holy Grail War and they became Childhood Friends, which arguably made her fall harder for him this time around. In Rin's case, he piqued her competitive streak after he managed to rank higher than her in school ratings in spite of him being an orphan, the captain of the archery club and holding a part-time job at the same time and the fact he's the best friend of her Sitcom Arch-Nemesis, Ryuudou Issei.
Instant Armor: Twisted Embrace, a Mystic Code crafted by Medea for Shirou.
Instant Costume Change: Realistically done considering the setting. Shirou manipulates black cloth with his prana and wraps it around his body to disguise himself as the Archer and then undo the process when he's done using it. In that way he doesn't have to worry about leaving an incriminating outfit for someone else to find.
Katanas Are Just Better: Shirou owns a nodachi in later chapters. It is the actual Monohoshizao which was owned by the real Kojiro Sasaki. Shirou managed to perform a degraded form of Tsubame Gaeshi due to his special ability with all things pointy, resulting in some serious Bad Ass.
Kick the Dog: Guilford is not above using a Command Seal to torture Caster.
Guilford: Caster... SUFFER!
Malicious Slander: The students of Homurahara Gakuen have a tendency to come up with somewhat sordid explanations for things. For instance the "Did They Just Have Sex?" example above and when Yukiko went missing, some said she was dragged into a ring of drug and prostitution by her inexistent secret yakuza boyfriend.
One day Medea decided to turn Shirou's Workshop from a few-square-meters room into a vast underground space. This could be a nod to the time when she built a replica of an entire Greek city under the Ryuudou Temple in the anime.
As a rarely seen in F/SNFan Fiction, Rin finally summons a Saber-class Servant from the beginning and, just like Nasu said, they make an awfully good team together.
To keep his fighting prowess hidden and protect his Secret Identity, Shirou is cautious of always take a beating if he found himself in a fight undisguised (read: jumps in to protect someone).
Taiga is this as well, picking up clues on the nature of Shirou's injuries in Chapter 20 from scare hints and, as Shirou explained, she only puts on an act when it's not serious.
OOC Is Serious Business: If Taiga goes without breakfast one day after declaring "I'm not hungry", you know it's serious. This is from the time when Shirou's injuries make her decide to try to put a stop to his nighttime activities for the sake of his well-being.
Spit Take: Waver spat his drink in Jun's face after seeing the Archer on TV carrying a nodachi. Spoiler-y explanation: Evidence of usage of a long blade was pretty much the only clue Waver had on the people behind Guilford's demise.
Trick Arrow: Shirou can modify his arrows on the spot with Reinforcement and Alteration for different purposes. As a Technical Pacifist, he usually crafts them with a metal ball instead of pointed head to use them as an incapacitating blunt weapon.
He can add runes through Alteration for things such as making a flaming arrow as well.
The Stoic: Kuzuki. He learns about Shirou being a Magus, Archer, and the Holy Grail War, and best he could do was say it was troublesome with no expression at all.
Tall Poppy Syndrome: Except for his partner Adachi, detective Dojima is not too popular among his peers because of this trope. This being Adachi, it's not saying much.
What Measureis A Non Human: What sparked the battle in chapter 25. Shirou refused to kill Satsuki once he realized she retained human sensibilities and self-awareness by impossibly skipping the Ghoul/Living Dead phase and becoming a full-blown vampire in a matter of minutes, leaving him with a someone who need human blood to survive but has yet to hurt a person because of it. On the other hand, Ciel chose to exterminate Satsuki because an anomaly like her has an enormous potential to become a powerful Dead Apostle if given the time.