Okay so I'm responding to some of my comments.
Suzululu2moe asks how Shirou got reincarnated if he's in the Throne of Heroes. Well I actually based this on one of my Fate/Stay Night theories.
Okay, so you all know of the Saber faces, lookalikes of the original Artoria Pendragon. Well, I came up with a theory about them when I was playing the mobile video game Fate/Grand Order. In the France chapter, the party is attacked by Berserker Servant Lancelot. He mainly goes after party member Jeanne D'Arc, one of the Saber faces, screaming "ARTHURRR!" Normally I wouldn't have thought anything of this, as I'm sure that the knight was confusing her with Artoria because of their similar appearance, until one of the party members said that Lancelot recognized Jeanne as Artoria not by her appearance, but by her soul. This made me think.
Now hear me out. This is where the logic gets a little sketchy. So you know in the original Fate route, Saber dies and goes to Avalon (the place, not the Noble Phantasm). However, just like everything, I suspect that Avalon will one day be destroyed along with everything else in that Saber's particular universe. When Avalon is destroyed, most likely the entire world, Throne of Heroes, Alaya, etc. is also destroyed so Artoria's soul has no choice but to return to the Root, Akasha, where she is reincarnated. However, the Root is outside time and space, so she can be reincarnated in any time or place. This explains why Nero, Jeanne, and the other Saber faces. The only Saber face this theory doesn't include is Mordred, an artificial Saber face. Also, because her soul is recorded by the world as going to Akasha, Artoria's soul is briefly recorded by the Throne before being reincarnated again after death.
I've basically used the same theory on Shirou Emiya, using Solomon as the base reincarnation. You see, Solomon has this Noble Phantasm which erases him from the Throne of Heroes. However, if he isn't recorded there, then he has to be recorded in Akasha, leading to reincarnation. Again, without the limits of time and space, this lead him to reincarnate into Shirou Emiya, Angra Mainyu, and Amakusa Shirou Tokisada.
Please don't hate me for my convoluted theories and don't take it out on my fic.
Anyways, Shadow of a Memory asks why I'm making Shirou so powerful. Well, the reason is that with creatures like the Phoenix Force, Galactus, Thanos, Death, etc. I feel like Shirou needs more power. He was sent to this universe to wipe out a threat his multiverse felt threatened by. Also, I feel bad for EMIYA so I decided to give him a boost.
So now that that's out of the way, here's the chapter.
Shirou looked at the people in front of him. One was has dark skin with an eye-patch, it was obvious that he is in charge. There was also a ginger woman in leather suit, by her side was a man wearing a purple shirt and jeans. Their companions were strange. There was a robot, a man in a ridiculous American garment, and what looked like a Viking. The American guy and the Viking had some weapons as well, a circular shield and a war hammer respectively. Shirou used his Structural Grasp on them. The shield, which had a red, white, and blue color with a star in the center. It was made up of some metal substance that were foreign to him, but he could tell that it was very durable. The war hammer surprised Shirou, though. It was Mjolnir, the legendary hammer of Thor. He guessed that the Viking was some sort of warrior chosen by the gods of this world to use Thor's strength.
Shirou looked at the strange group. Because of the guy with the shield, he guessed that at least one of them spoke English. So he took a gamble.
"Excuse me," he said, "but do you know where I am."
Eye-patch was the first to recover. "You are trespassing. This is New Mexico, Earth and you aren't welcome here," he said.
Shirou blinked in surprise. "No mean to be hostile," he said, backing away slowly.
"Sorry, but you're coming with us for questioning," the woman said, walking forward. The magus could see she was armed with two handguns.
"Not in the mood," he replied. The woman brought out her guns and fired at him. Shirou easily dodged the shots and brought out Kanshou and Bakuya, his main twin swords. Using the married blades, he deflected her shots, rushed forwards, and sent a kick to her face. Or so he thought. The woman ducked the kick, and tried to retaliating with her own kick, which was blocked easily.
"Whoa! How'd he do that?" the red and gold robot spoke with a human voice. While Shirou was distracted with the human sounding robot, the woman tried to shoot him in the leg.
"Watch it," Shirou said, getting annoyed. His instincts kicked in and using Servant level strength, he punched her into a wall. That was when the others attacked. Shield guy threw his shield at him, which he ducked, but it bounced off the wall behind him and hit his's back. They rushed the magus, so he decided to activate one of my new Noble Phantasms. His torso began to glow brightly, and prana began to surround my body. When the light faded, he was wearing the armor known as Kavacha and Kundala, which greatly improves my defense.
"What kind of magic is this?" the Viking demanded. As he spoke, he twirled his hammer around and around.
"Interesting,' Shirou thought. 'This guy seems to know a bit about magic.'
Shirou's thoughts were interrupted when the hammer hit him. Even with this armor, the hammer still sent my flying back. Deciding that while useful, the armor was too prana consuming, he let it fade back to prana.
Shirou then decided to distract the strange beings. He threw Kanshou and Bakuya, traced another pair, threw the blades again, and kept on repeating the process. The blades began to repel and attract to each other, creating cage of the swords around the heroes. They did their best to avoid it, but they got a few nasty cuts.
The robot shot energy at him, so Shirou projected the American flag guy's shield. Like he thought, the shield was very strong, blocking the energy with ease.
The flag guy looked shocked. "How did you-," he started. He didn't finish because Shirou slammed the shield into him. The Viking roared in anger and pointed his hammer at him. Lightning shot out at him, so Shirou decided to switch shields.
"Rho Aias," he chanted, and a pink, energy shield appeared in front of him. It was shaped as a flower and had seven petals. The Viking's lightning struck the shield, and one petal disappeared. Shirou quickly sent the shield away the shield.
"Okay, then," Shirou said. "Let's fight fire with fire. Or should I say fight hammer with hammer."
He summoned a copy of Mjolnir to his hand. The Viking stared at the copy.
"Impossible," he breathed.
Shirou pointed the hammer at the Viking, who fired off his own bolt. Twin lightning blasts struck each other, each with the same amount of power. Then, the robot shot him with another energy blast. Shirou managed to dodge it, but was hit with more of the Viking's lightning.
"You will pay for your dark magic, mage," he growled. "You will face my wrath, the wrath of Thor!"
'So this guy is the Norse god of lightning, eh. Seems like the gods of this world are much weaker than I expected,' Shirou thought with interest. 'Though if he is a god, I have the perfect weapon for him.'
"Enkidu," Shirou whispered. Golden chains appeared and trapped the self-proclaimed god. "If you really are a god, then this should hold you."
Shirou smirked, briefly proud of his work, till he saw the robot shooting lasers and the still-conscious American throwing his shield at him. Luckily, Shirou summoned Rho Aias again to shield himself. Using reinforced legs, he jumped back and summoned his bow. He quickly traced the sword Hrunting.
The robot laughed. "What are you going to do with that," he jeered. "Shoot us."
The Counter Guardian smirked. "Yeah, kind of," he replied. Shirou altered and reinforced Hrunting till it turned into a pitch-black arrow, a Broken Phantasm. Pulling it back, he aimed it at shield guy. The Iron Wrought Magus fired and it turned into a red, bullet-like projectile. Like Shirou expected, the guy managed to block it, but it quickly maneuvered in the air and slashed at his back.
"Now it's your turn, Tin Man," Shirou said.
"Cap!" he shouted. The metal man turned towards Shirou. "You'll pay for that."
The robot then shot missiles from his shoulders at the magus. He dodged them, rushed towards the robot, and gave the automaton a swift Servant-strength punch to the face.
"Ouch," he said. "That's it, no more Mr. Nice Genius Millionaire."
He shot more lasers from his palm, which Shirou managed to block after summoning Nine Lives, the sword used by Hercules. He slammed the man with the flat side of the sword, finding the metal man's to be annoying, but Shirou didn't want to kill him. The metal man slammed into a wall and fell unconscious.
Shirou heard a clapping behind me. Eye-patch was slowly clapping. The copies of Kanshou and Bakuya were still surrounding us.
"That was quite a trick you did there, kid," he said. "You managed to kick the ass of Earth's mightiest heroes. Yet you didn't kill them. Impressive.
"I'd like to come with me for some answers," he continued. "My name is Nick Fury. Nice to meet you."
'He's charismatic, I give him that,' Shirou thought. He briefly considered joining him. Briefly being the optimal word. Then again, he did need to get information about this world.
"Fine," the magus said. Enkidu and the copies of Kanshou and Bakuya disappeared. Thor fell to the ground, glaring at the Shirou.
Shirou walked up to him and stared into Fury's good eye.
"Let's go."