So, in this fanfiction, I'm combining Shirou with his parallel selves, his past lives (which I've picked), and those who could be confused for him.

His past selves include the King of Magic, Solomon; Amakusa Shirou Tokisada (from Fate/Apocrypha); and Angra Mainyu, God of Evil. Each version of his past selves have something in common, they were each a tool. Archer/Shirou Emiya was a tool of Alaya for humanity's salvation, Solomon was a tool of God to increase humanities power, Amakusa Shirou was a tool of humanity to lead and hold their hope, and Angra Mainyu is a tool of humanity to hold all their evils and sufferings.

His parallel selves include all versions of Shirou Emiya, but its more than that. Due to him having unknown origins, its possible that after the Fourth Holy Grail War he was adopted by other magical beings. Some of these beings include: Zouken Matou, Kishur Zelretch Schweinorg, Waver Velvet, Jubstacheit von Einzbern, Aoko Aozaki, Touko Aozaki, Gilgamesh, etc. This gives him some of the magical abilities of each parent, though when it comes to the Second Magic, Kaleidoscope, he can only properly utilize it through Second Magic mystic codes. Otherwise, he can just pull prana from other dimensions.

People who could be confused for him mean that people who are extremely connected to him in some way. This list is Avenger Justeaze von Einzbern, Assassin Kiritsugu Emiya, Archer Chloe von Einzbern, and the Grand Archer (Goetia).

He has the powers and memories of each of these beings, but rest assured, he's not OP. In order to make use of all of his abilities, he must think of ways to use them all. Also, his body is a bit new, and Shirou will have to wait for his body to adjust to the power before going to its full potential.

If you want more information, read some of my stories on Wattpad. It's in there somewhere. Illyasviel is also in the same boat (when she's not summoned as a Servant).

Anyways, here's the story.

Nick Fury was pissed. His Avengers consisted of an immature playboy with some toys, an ancient relic of a super soldier, a man who's a ticking time bomb, a so-called god, and his best agent. This will not be easy.

Fury massaged his temple, felling a headache coming on. He heard the sound of footsteps coming towards him. He turned to see one of his agents, Jenkins or something like that, running towards him, panic on his face.

"What is it, agent..." Fury asked.

"Jemson," the agent sighed, panting exhausted. "We're detecting massive energy fluctuations at the New Mexico base where Loki came from."

"What!" Fury shouted. One insane alien bent on world domination was enough, he thought. Could this be Loki's backup.

"Send in the Avengers and a squadron or two of our best agents. Whatever this thing is, I want it contained," Fury ordered, anger and worry on his face.

"Yes, sir," Jemson said and ran off.

This is going to be a long day, Fury thought.

Shield Facility, New Mexico

Fury, the Avengers, and twenty-four armed SHIELD agents walked were surrounding the area. Fury looked back at his superhero team. He couldn't see Stark's face under his metal face plate, but he knew that Stark probably had a bored expression on his face. The Captain was looking calm as ever, being an experienced veteran of the battlefield. Thor, however, was looking pissed. All he wanted to do is bring his brother and the Tesseract back to Asgard, put them under lock and key, and maybe see Jane. Dr. Banner, A.K.A. the Hulk, was only here for to analyze anything there. Natasha was standing beside him, because it was his job to protect Dr. Banner and keep him from showing his big, green side. Both had anxious faces, wondering what is going to happen.

"Director Fury," an unnamed soldier said. "We've surrounded the area. Heading in on your mark."

"Let's go," Fury ordered. They all headed inside the facility. Fury and the Avengers searched every single room, until the only room left was the room that once held the Tesseract. When they got inside, their mouths dropped down. Inside was a glowing blue portal, similar to the one Loki came from.

"Well it looks this little field trip will be more fun than I thought," Stark said. It was obvious that he was excited to see what happens next.

"Careful, Stark," Rogers said. "We've no idea what will come out of it."

Suddenly, the portal grew bigger. In that moment, the portal had become twice its original size. Then, in an instant, it shrunk and disappeared. In its place was a man.

"The he-" Fury shouted, but he couldn't finish due to a wave of energy, pushing back everyone but Iron Man, Captain America, and Thor. The portal seemed to become a solid object. It turned into a red cloak, hiding a man underneath. Rising, the man looked at the heroes.

This man had distinct characteristics, white hair, dark, exotic skin, and golden eyes. Underneath the shroud, he wore black armor. He looked at the heroes and smirked.

"Excuse me," he said, "but do you know where I am?"