Why didn t Red A tell Saber that he was the future Shirou and recognized him

Because Shirou wants to save everyone and create a perfect world.

The process by which Shirou turned into a red A

Ever since Kiritsugu saved Shirou in the Fourth Holy Grail War, Shirou has had the idea of becoming a "partner of justice". Red A is actually the future of Emiya Shirou. After experiencing the Holy Grail War at that time, Red A did not choose to open a harem.

Instead, he became a magician with the goal of becoming a "partner of justice" and went around the world to help people and save the many.

When Shirou was saving the people in the power plant, the core of the power plant melted down, but he wanted to save everyone in the power plant, and then the restraining force appeared, and he signed a contract with Shirou to let Shirou use him as a tool man after his death, shuttling through various world lines, protecting all kinds of people so that he would save everyone, and Shirou agreed.

But after Shirou became a hero, he kept repeating himself in the cycle of salvation and killing. At this time, Hong A realized that there was no such thing as a happy ending for everyone, and later he was falsely accused by his partner of being the initiator of the war, and was pushed to the guillotine, and the guardian Emiya died, and he was also forced to the end of his ideals.

After his death, he became a Heroic Spirit, that is, Red A, and made endless atonement for his stupid goals and ideals.

Follow-up

In the process of saving the world, Red A denied the practice of sacrificing a few people, so he planned to return to the Fifth Holy Grail War and personally eliminate Emiya Shirou, who was still a student at the time. But because of the previous relic necklace, Red A was summoned by Rin Tosaka to participate in the Holy Grail War, so there was the story of the Fifth Holy Grail War.

FatestayNight Shirou knows that Red A is himself. Shirou suspected that it was himself when he first saw Red A.,As the plot develops, Shirou will know later.,Exposing Red A's identity is FatestayNight Episode 19.,Archer's true identity is finally revealed.,Heroic spirits are summoned from the present and the past.,And the future times that haven't been seen.。

Character characteristics of FatestayNight Shirou

Emiya Shirou is at the end of his ideals,Opposite to the partner who has always believed in the justice of this ideal answer,06 version did not explain in particular detail,Only at the end of episode 14 explained to the audience the identity of Red A,Because Red A disappeared in defeat and left Rin Ruby as a hint,But Shirou still insists on his ideals and will not change because of Red A。

Although there are red A in the three lines, but the attitude towards Shirou, Rin and Saber in each line is very different, for example, the red A of the Rin line wants to kill Shirou, and the Sakura line is diametrically opposed, from the dialogue between him and the assassin is not an orthodox pure heroic spirit and leaving a hand to know, he is actually an unorthodox heroic spirit who already knows his true identity named Emiya Shirou.

fate, Red A is the future Heroic Spirit, but his identity is Shirou himself.

Red A is Shirou's Heroic Spirit, and in the future, in order to prevent himself from being a partner of justice, he has made a pact with the "world" and has become a hero who evokes miracles, and participates in the Holy Grail War as an archer.

The medium through which Rin summoned Red A was the red diamond, and the future Red A remained on his body.

Red A is the future Shirou who died because of salvation.

So he wants to kill his past self and make him give up justice.

It's the same person, Red A is Shirou who will become a heroic spirit in the future.

It's the same person, and Red A is the appearance of the future Shirou's heroic spirit.

Didn't Shirou be shot through the heart by Brother Dog, and was later resurrected by Rin with a gem, and that gem was later kept by Shirou with him. The medium is the gem, not owned by Rin but owned by Shirou.