Shirou Kotomine's powers and abilities
Abilities
Amakusa Shirou Tokisada was summoned as a Ruler-class Servant. He was a figure whom had been as close to a "Saint" as you could possibly find in the Far East, but the sainthood of this tragic youth had never been recognized.[6] Amakusa Shirou was made to become a Ruler by foul play, his summoning in the Third Holy Grail War fooling the system into thinking he was qualified. If there wasn't the case of the Human Order Incineration Protocol, the chances of summoning him would be very low.[7] As a Servant, he would be third-rate if he weren't Ruler.[5][7] Shirou was neither outstanding in combat nor proficient in Magecraft to the level of a Caster-class Servant, but he continued to win, and survive, in the Third Holy Grail War.[6] He is more of a Spellcaster than a Magus. He may barely be able to qualify as a Caster.[7] He was ever heedful and never gambled, fulfilling his duties even as he thoroughly cemented his defenses.[6]
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As part of the Church's Assembly of the Eighth Sacrament, Shirou is skilled at using Black Keys. These were the thrown-type Conceptual Weapons favored by agents of the Church and they were strong enough to purify Dead Apostles but the power of his Black Keys was far too extraordinary and abnormal. The Black Keys were particular useful against the Nameless vampire. He is seen capable of running and throwing four Black Keys without even looking back when he used it to slow down Frankenstein. He inserts a spell into the hilts of his Black Keys beforehand activated by the word SetI announce that allows them to return to their intended target after being deflected.[17]
He is an adept swordsman and he wields the enchanted Miike Tenta Mitsuyo when Black Keys are not effective against his opponents. Shirou’s sword technique is average, but he manages to fight extremely well due to his Noble Phantasms.
Skills
Class Skills
Magic Resistance (A Rank): While he holds this skill equivalent to a strong Saber-class, he does not cope with the sacraments of the church.[1]
True Name Discernment (B Rank): As a Ruler class, he gains this skill. Status information such as the true identity, Skill and Parameters is automatically revealed when he directly encounters Servant.[1] There are certain limits, Servants with hiding capacity such as Mordred's Noble Phantasm Secret of Pedigree can mask out her identity, however it depends on his luck level to bypass this.[1] As he was dispatched by the Church with the duty of being the overseer of this Great Holy Grail War, he possessed the Spirit Board (霊器盤, Reiki Ban?) that was given to the overseer and could perfectly grasp the state of all fourteen Servants. As his "True Name Discernment" skill makes him need to directly encounter Servants to see their status, Shirou must rely on Spirit Board to track down any Servants and learn their identity. It was particular useful when Siegfried had committed suicide and Shirou suspected something was odd since his name was not entirely gone from the board.
God's Resolution (—): The highest privilege for the Ruler class skill. Normally Ruler-class would possess two Command Spells for each Servants that participated in the Holy Grail War. However, as Shirou is not a participant of the Greater Grail War, this skill has been lost.[1] As he participated as a Master, he only has three command spells for Semiramis. While he leads the Red Faction, he made sure that the Red Faction Servants do not interact or meet with their respective Master. While he could steal the command spells by cutting their arms, Shirou decided to avoid this method. The reason is that he wants to avoid lying to Karna who excels at perceiving deceptions. This is the main reason why he'd manipulated the Red Faction Masters into his puppet, so they could peacefully hand over the three command spells of their Servants and provide enough Magical Energy until his connection to the Greater Grail. Eventually he obtained their Command Spells, his arm was engraved with eighteen Command Spells of Archer, Lancer, Rider, Berserker, Caster and Assassin.
Personal Skills
Revelation (A Rank): A personal skill equivalent to "Instinct". Instinct is a sixth sense regarding battles, but "Revelation" accommodates all matters related to the achievement of a goal (for instance, choosing the most suitable path while traveling). Because there is no basis (so he thinks), it cannot be explained well to others.[1] His Revelation comes from a vision from his arm, if he studied under Thomas Edison, he would be undergoing Conceptual Improvement until it became a rocket and the birth of Shin Amakusa Shirou.[7]
Charisma (C- Rank): The natural talent to command an army. Although he cannot run a nation, he can share those with his like-minded and strong ties comrades to death. Thanks to his charisma, it is possible to make others believe in the contents of the "Revelations" skills without basis.[1]
Baptism Rite (B+ Rank): A type of magecraft that changed style into a church form. It is effective on a spiritual body. By linking his two Noble Phantasm, it is even possible to make a Servant go through a sublimation process.[1] His Baptism Rite was extraordinarily powerful that it wasn’t possible for a human. He used this chant on the nameless monster, who had once been Vlad III and Darnic Prestone Yggdmillennia. The nameless monster very existence was melting away as he began to emit white smoke, the vampire evaporated away right down to the final fragment of himself.
Noble Phantasms
By the strange device called faith, after dying and becoming a Heroic Spirit, he became capable of exercising miracles. Therefore he possesses two Noble Phantasm, Left Hand - Xanadu Matrix and Right Hand - Evil Eater.[7] Due to the unique nature of his Noble Phantasm, his arms are connected to the Thaumaturgical Foundation which allows him to effectively use any sort of Magecraft with its Almighty KeySkeleton Key (万能鍵スケルトンキー, Ban'nō KagiSukeruton Kī?).[1] He can also combine them to create a powerful technique called Big Crunch.
Incarnation
Upon being incarnated, he had the abilities of a regular human for seventy years until again establishing a connection with the Grail in Romania. He still displays superhuman capabilities in that state, easily running at speeds exceeding sixty kilometers per hour.