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Pov switch, or mini author notes in the middle of a chapter.
Dragon's talking

Loki's Pov:
I can't believe this. I lost! Curse that dragon and his damned rider! (somewhere in Midgard: Hiccup and Toothless coughed in sync) I was so freaking close to victory! Next time, I am gonna make sure that the kid doesn't come in my way again. Ever! Ya, hear me, kid? I will kill you and that blasted dragon of yours! Thor and Odin will be going down with you! That is my promise!

Hiccup's pov;
I swear on Thor that someone's after me. I can feel it in my gut. "I hope Loki doesn't want to doom me again..." I mumble,  knowing something's wrong. "I am done with the stupid games" I mumble further, letting Toothless know what was on my mind.

"That, I am sure, is not exactly possible. You know that you're his favorite to mess with, so who knows what'll happen next. Maybe, we'll have to face the Loki himself, someday! Who knows, but one thing is for sure, I will always be there for you" Toothless exclaimed as I couldn't help but wonder why we were against these fantastic creatures anyway. They are just too intelligent, free and simply amazing creatures.

"Man, why couldn't we've become friends since I was 5? Where were you all this time, bud?" I ask myself, amused as we keep flying. When we reach the old village, to see it completely different. Just kidding, there are a few changes. Like the fact that there are statues of my friends and myself on our dragons. I went to my statue to see what they thought of me.

Hiccup Horrendous Haddock the Third
"The best dragon-rider to ever exist.
Tamer of the unholy offspring of
lightning and death itself.  PeaceBringer,
selfless, intelligent and Simply amazing.
Son, Hero, heir and a true friend.

Toothless the night fury
"An amazing dragon much like his rider.
Last of his kind. Alpha dragon,
Alpha, brother, and loyal friend.

I can't believe it. I walk to the great hall and open it to see it just like I remember, just a lot emptier than last time. I run to my home, running to what used to be my room. I look at everything to make sure my things are there before going to the center of the village.

I can feel some eyes on me so I mount Toothless and we fly off, going to where we had set up camp before Toothless and I ended up in the past. We make our way there, but Toothless's earpads twitch and we fly a different direction, back to where I  met Thor. Thor. Even the name makes me excited!

When we got there, we land in the middle of a clearing, in front of Thor and a young lady. "Thor" I great, as he nods his head back in a simple greeting.

"Greetings, young warrior! I've visited Valhalla from your behalf. Your whole tribe is happy that you're okay, and they wish you good luck. They say that they miss you, but want thy to be happy and live to your fullest" Thor boomed as I gladly nod my head in thanks.

"I would like to ask though, do thy want to change your name, or shall it stay as Hiccup Horrendous Haddock the Third," Thor asked as I think it through. "I would like to change my name into what I was known for amongst the other dragons with a more modern first name. Toothless has already changed his name to Nightwing, and the dragons always called me sparrow, so... I guess I am rambling now, great" I end, kinda awkward.

"Ah.. don't worry about that, young Viking! It's okay to ramble sometimes! But we need a modern name for you, so Jane... Can you help us?" Thor asks, looking at a brunette who I guess is Jane. "Please follow me then, sir," the women say, leading me to two other people who have this computer 💻 that she starts searching on. "Okay, what letter would you start with?" She asked as I think it through. "H, please. My last name started with that. If not, then S... actually, I want a middle name with the meaning 'dragon' too, since my best friend is one" I answer as she nods her head.

"Okay then. We've got Harry, Henry Shane, Hiro, there's a zillion here, but since you already have a dragon, then we could call you Deacon, Ryu, or..." she says as I stop her. "I wanna keep Jack as my name. With the second name Ryu, so it will be Jack Ryuu Sparrow" I answer, as I notice that the time travel has turned me and shrunk my armor into a 15-year-olds body. Ugh😑.

"Very well then, Jack, we need you to start school with the normal 15-year-olds, so you will have to stay with us until your finished" Ms. Jane told me as I nod, happy to be learning something new. "Yes, but first... I need to go and check out someplace that should have some more dragons, I mean, they can't just die out, so well. Just check It out, real quick" I mini ramble before Toothless and I fly off.

Jane's Pov:
That name is perfect for him. He's good looking, sweet and clearly a gentleman. I haven't seen his face yet though... anyway, Jack is a perfect name for him. I can't believe he has a dragon, I mean, where are they now, then? could they have truly died out?

Hiccup's Pov:

I and Nightwing flew through the air as we sped toward the hidden world. As we flew over some clouds, I felt like we were being followed so we flew faster while I leaned forward.

When we got there, Toothless flew through the shallow gaps, spinning and turning as we neared the one place where I saw Toothless standing with the light fury. When we got to the center of the nest, we met up with a lot of dragons, with even a few Vikings! "Woah.... this place sure has grown since we last came here, right bud?" I ask Nightwing while I stared in front of me. "Sure has, Nick! This place is awesome!!!" Nightwing answered before we flew up to the closest dragon rider.

"Who are you, and what is that, if I may ask?" The biggest guy asked me, excited. He reminds me of Fishlegs, though... just too old to be him or young in this case "uh... this is a Night Fury. I came here from the past, somehow, so I decided to check here. What happened and who are you?" I ask as the guy's eyes widened. "Hiccup? How in the name of Thor did you get here? And by the way, a few years after I turned into an elder, I was flying through some clouds to get here and I've been here ever since. I went back but no one was there" Fishlegs told me.

"Oh... I sure lost a lot... but you won't believe who I met" I told Fishlegs with a sly grin. "Who did you meet?" He asked as my grin widened. "One word: Thor," I tell him, raising one finger in the air as Fishlegs eyes widen in surprise. "Really? How does he look like? How..." Fishlegs start as I give him the drawing I made on my way to Berk. Well, future Berk, but still. Fishlegs started squealing like a girl while I chuckled in response. "Did you see Mjolnir as well?" Legs asked as I nod my head. "I EVEN SAW THOR IN ACTION!" I yell, fist bumping the air as Fishlegs mouth fell open.

"I am going back, though... I'm starting school and I can't wait to learn more about this new world!" I exclaim, excited. "Okay, and I will hopefully see you later" Fishlegs answered, as we left back to ms Jane to see if I can enter this school...

Unknown pov:
I watched the boy go north-west, and I followed until the signal cut off. After a little while, the signal came back, heading back to the very place it came from. New Mexico. I watched with my one eye as the boy flew throw some clouds before I send the signal to my redheaded spy, who nods her head before leaving in her personal jet plane. This shall be interesting...
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What is going on?
What happened to the village?
Why did the dragons move to the old dragon nest?
Who was the person at the end?

From now on, every chapter will have a new special question, and the first to answer will get a shoutout, so here's the first question:

Why is 'Jack Ryu Sparrow' the perfect name and why did Hiccup choose it? Who does it represent?

Question of the previous chapter since it didn't have any:

What is Loki's true form and What is his real name?