(A/N) Clarification: Naruto is seeing other universes. They'll mostly be mine, see if you can recognize all of the stories he ends up seeing. There are a couple of levels of travel, the most common one for him is just seeing people, they're sort of mirages, nothing else about his surroundings change. There's People and some of the surroundings, people see him moving around, and he can sort of interact with the surroundings, not much though. There's also the one where he just sees other places through the other Naruto's eyes, then the other places on his own. He can appear something as a ghost in that case, so keep that in mind. He can sort of interact, but not much. Just small things, doors, books, etc. One person guessed the reference I was making with the title: Alice Through the Looking Glass. Second book of sorts to Alice in Wonderland.
Naruto was bored. The kind of bored that meant he had basically nothing on his mind. The matron had left him alone with nothing to do again, so he was bored. Three years old and nothing to do. The door sort of opened, like a sort of mirage, and a sort of see-through teenager walked through. He had silver hair all sticking up to one side, and only a little bit of his face showing.
Naruto held out his arms to the mirage, begging him to pick him up. The teen ignored his pleas, just staring vacantly into the crib Naruto was kept in. Naruto gave up after a bit and merely watched the teen. He left soon after, disappearing in a burst of smoke and a few leaves. Naruto began crying, not wanting the person to leave, but the only person that came was the matron, who hit him to make him shut up. Naruto reduced his cries to sniffling, and the lady left.
The silver-haired teen came in a lot. Mostly just staring at him. Each time it was a mirage. Naruto wondered why the real silver-haired person hadn't come to see him.
When Jiji came to visit him, he watched him quietly, waiting for a sign that he wasn't a mirage before begging to be picked up. Jiji clearly thought it was odd, but didn't comment about it. The silver-haired teen came in while Jiji was there sometimes. Naruto always looked to him first, then watched Jiji, before looking back, always waiting for the sign they were mirages. The teen was always a mirage, but Jiji never was.
He learned to read lips almost before he learned to talk.
He was almost five when he first started seeing other Naruto, in the same room as him. The other Naruto couldn't see or hear him, so he just sat and watched.
Other Naruto paused, formed a hand sign, and a person and a fox appeared. Naruto decided to try it himself. He knew what chakra was, sort of, so he channeled chakra into the hand sign, and a clone popped out. Naruto smiled at his clone Naruto, who smiled back. The matron began to open the door, and the clone Naruto popped quickly in a puff of chakra smoke. The mirage Naruto looked up, and quickly began tearing up. Naruto watched the other Naruto in quiet horror as he began to pack, the fox and red-headed teen-clone helping him. Other Naruto ran out of the door, and Naruto debated following him. He didn't, but he almost did. Ultimately, he followed the matron to where she had him folding clothes.
He didn't see that specific other Naruto again. He assumed he'd died or run away or something. The occasional vision of a place that wasn't Konoha, but drenched in rain, disproved that assumption quickly. The silver haired person was in those vision, often crouching down and ruffling Naruto's hair. Naruto happily basked in the interactions that other version had with the people around him, enjoying the positive looks for once, even if they weren't exactly for him.
He saw dead Uchiha for a week. He saw them any time he went near the Uchiha compound. He eventually just started avoiding it. There were still Uchiha to him, the bodies were just mirages, but he avoided it anyway.
His Jiji started him at the academy, giving him an apartment all to himself. He was five, he could manage, he was almost ready to start the academy.
He saw a city, a beautiful one, two months into the academy. Filled with redheads and with a woman that called him 'grandson'. One day, he saw a tall woman striding past him, blood red hair up in buns, himself running at her heels. He saw her a lot after that.
A couple of times, it seemed like he was in some sort of cave. The Fourth Hokage was there, as was a redhead, the silver-haired teen, a brown-haired girl, and a black-haired boy. They were usually cooing at him, and Naruto began to wonder if his parents were the redhead and the Fourth Hokage, Minato Namikaze.
He started looking up the people he saw, finding out that the red-headed lady he saw around a lot was Mito Uzumaki, wife of the First Hokage. The redhead he was pretty sure was his mom was Kushina Uzumaki, basically cementing that she was his mom. There weren't any other Uzumaki in the village. He was pretty sure the black-haired person he saw in the cave visions, as he called them, was Madara Uchiha, and the bouncy brown-haired one was Hashirama. He wondered why none of Hashirama's personality was in the history books he found, then he remembered the excess of excitement the man practically oozed and decided that was why. The other silver-haired man, older than the teen, with red marks on his face was the Second Hokage. The cave visions were also where he was first introduced to Orochimaru, who, while not common, was there a lot. Anko he saw around the village sometimes. He didn't dare approach her though, she was scary. He saw someone he found to be Shisui Uchiha, someone he saw around the village sometimes too. The big blue shark man was harder to find, but he managed and found his name was Kisame Hoshigaki.
He had his first interdimensional incident the day before his 6th birthday. He was just sitting in his apartment, the one Jiji had given him the day the academy started and wondering if he could find the cave vision instead of it coming to him randomly. He ended up thinking about the brightly colored ponies some girls had been playing with at recess, he then blinked, and ended up in what looked like a world full of brightly colored ponies with pictures on their, erm, flanks? Was that the right word? Naruto wasn't sure. He wandered around for a bit, accidentally walking through a couple of ponies when he didn't look where he was going.
He ended up in what appeared to be some sort of bakery, with a bunch of cakes and pastries on display. A bright pink pony was standing behind the counter and looked up as the door opened. Well, Naruto didn't really open the door, but he certainly moved it some.
"Hello!" The pony chirped, moving around the counter. "Who're you? What are you? Why are you all see-through?"
Naruto blinked at the pony. "You can see me?"
"Can't everyone?" The pony asked.
Naruto shook his head. "You're the first one. I'm Naruto, and I'm a human. And I dunno why I'm see-through to you."
"My name's Pinkie Pie!" She chirped, sticking her hoof out to shake. Naruto mimed wrapping his hand around her hoof and shaking. Pinkie seemed to appreciate the effort. "I need to throw a party welcoming you to Ponyville!"
"Uh, won't that be a problem if no one but you can see me?"
Pinkie thought about that. "Maybe? Let's go see Twilight! She can find a spell for anything!"
"Okay?" Naruto managed before Pinkie attempted to push him out the door. It didn't work, but Naruto pretended it did.
"So, you're telling me there's a person there?" Twilight asked, raising an eyebrow.
Pinkie nodded enthusiastically. "A party's no fun when only one person can see the recipient, so I want you to see if you can find a spell or something to let everyone see him!"
Twilight rubbed a hoof over her face. "Alright, I'll check, maybe go see Zecora if I can't find anything? I think this is more of her specialty. Spike!"
Naruto watched curiously as a tiny dragon ran in, a scroll and quill already at the ready.
"Spike!" Twilight ordered. "Send a letter to Princess Celestia."
Naruto decided to see if any of the books were interesting. He didn't get most of the titles, but he found some comic books and settled for looking through them. He was impressed he could hold them, and wondered if they were just floating to everyone else.
"I got it!" Twilight said sometimes later, waving a book with her magic. Naruto jumped, having been quite engrossed in watching the panels of some weird pony with green magic hair battle more ponies with superpowers. He couldn't read it, but it was amusing to look at the pictures all the same.
Spike sidled over to him as Twilight explained in great detail what she was doing. "I like those comic books too."
Naruto nodded. "It's pretty cool. Even though I can't read it. It's fun looking at the panels anyway."
Spike then decided it was upon him to explain the plot, and Naruto followed happily along, some of the pictures making a lot more sense than they had before.
"Are you done?" Twilight asked impatiently a moment later.
Naruto ducked his head, immediately putting the comic back and standing. "Yeah, sorry."
"It's fine," Twilight dismissed, her horn glowing. "Ready?"
Naruto nodded, bracing for whatever would happen when Twilight did the spell or whatever it was. It felt sort of tingly, then Twilight gasped, and he opened his eyes.
"You're not a pony."
"No, did you think I was?" Naruto asked, confused.
Twilight shrugged. "I mean, I couldn't see you, and Pinkie didn't provide a description, so I assumed you were, yes."
Naruto shrugged. "Well, I'm not."
"Now that ponies can see you," Pinkie broke in loudly. "We can have a party!"
Twilight shook her head at Pinkie's enthusiasm. "Were you going to set it up and invite people to it, or just say everyone already knew about it."
Pinkie blushed, although it was hard to see. "Oops! Gimmie a few hours, and I'll have everything ready!"
Naruto snickered as Pinkie zoomed off, leaving slight skid marks where she'd been.
A few hours later, Pinkie Pie bounced back in, and dragged him off to some place apparently called Cupcake corner.
The party was interesting, Naruto having never been to a proper one before, which Pinkie seemed to take as a personal insult, much to Naruto's quiet amusement.
By the end, he was pretty sure he'd met most, if not all of the ponies in the town, and he was relishing the lack of glares. Everyone was so nice to him, receiving Twilight's announcement about him being some sort of friendly extra dimensional creature, whatever that meant, pretty well.
Until they were interrupted.
(A/N) *snickers* Anyone wanna guess who interrupted them? The spell Twilight did basically created a sort of magic form that he inhabited, if that makes any sense. She made it so he could be seen, and he could properly interact with their world. It won't have to be recast after that time, and if he visits there again, the spell will still be in effect. PM with questions, or review with them, I don't care. I will reply though. To the best of my ability. No, this isn't a crossover with MLP, not really anyway, they'll keep popping up again, as much as the other universes will, but due to them being a completely different fandom, it's a lot more difficult for Naruto to see into their universe. In his universe, he is completely stationary, looking for all the world like he's meditating, cause his mind is in a completely different place.