[No one's POV][On Earth]
Many military soldiers and Scientist were walking walking in various places inside a secret facility.

It was overrun by the Lead Researcher Doctor Richard Smith.

A pair of Scientists ran up to get his attention. The male scientist is Henry Swartz, while the woman's name is Mikaela Varn.

Alice: Sir. You should take a look at this.

The Head Scientist looks at the tablet as it shows the stats of the device everyone is still researching even to this day.

This unknown wrist was a mystery to all. Many speculate that this came from a alternate universe, as the components of this wrost device is very high tech, even for Apex Cybernetics. Because it can fit into a human's wrist, many people(soldiers, scientists and even civilians) tried the device on to see if either of them were compatible to be its user.

However, the device rejected each one of them. Some even died from either from the electric shock or the Hollow Earth energy overloading their bodies.

Because of this, the device was voted to be locked up and never be touched. It stayed like that for about 15 years until the United States government decided to reopen the unknown device for testing once more.

Male Scientist: This thing contains DNA from certain Kaiju.

Dr.Richard: What kind of Kaiju DNA?

Male Scientist: For the one's we discovered: Godzilla, King Kong and MUTO.

Dr.Richard: Is that so? Let's call it the KaijuTrix.

Female Scientist: KaijuTrix?

Dr.Richard: This contains DNA Samples of some of the strongest Kaiju's that ever lived. If possible, try can transform into Hybrid versions of the said kaiju.

Male Scientist: You mean like Gojira?

Dr.Richard: Yes. Sadly, we've do not have a person to try it since the past failures.

Henry: Actually..

Dr.Richard: Hmm?

Henry: I do have a close friend that volunteered for a military procedure that could have this KaijuTrix functional.

Dr.Richard: Is that so? Where could this young man be?

???: I believe that you were talking about me, doctor.

The Head Doctor and the Duo turned to the man they were talking about.

A young 25 year old man can be seen walking towards them with his father and a few military personnel..

*Your military Clothing*

Rank: Sergeant.

Your father: General Talon Hashira

Felicia(Grenader)
Emma(Rifleman)
Alice(Marksman)

Y/n: You know, you didn't have to bring two of my military personnel.

General Talon: That may be true, Son, but with the Kaiju that can pop out of nowhere each time..I prefer not to have you in most danger.

Y/n: I guess you have a point.

Emily(Rifleman): We just want to be sure that you are okay, Y/n.

Alice(Sniper): Yeah. you're our squad leader.

Felicia(Grenader): No way we want to see you hurt.

Y/n: *Rolls his eyes; turns to Dr.Richard* Nice to see you again, Dr.Richard.

Dr.Richard: I'm glad you came, Y/n.

Y/n: You can thank Henry for persuading me.

Henry: hehe..

General Talon: So..where is my son gonna be tested at?

Dr.Richard: We have a large testing lab a few feet away.

[Timeskip]
Y/n was seen in the middle of the testing lab, with the KaijuTrix in front of him.

His father, Squadmates and the scientists are inside a monitor room, observing the soldier. Henry reaches towards a mic and turns it on to speak to him

Henry: Hello, Y/n. Can you hear us through?

Y/n: Hello to you two, Henry. And yes, I can hear you.

Dr.Richard: Interesting.

Y/n: *turns to the device* Is this the thing that you were talking about?

Dr.Richard: Yes. Due to the unique blood type you carry, which shows some resistance to radioative particles..it's possible that you'll be able to bond with this Device.

Y/n: Okay.

Dr.Richard: Now, reach your arm towards the device.

Y/n turned back to the floating device in front of him. He reaches towards the floating device and as the thing was responding to his call..the KaijuTrix opened up and latched onto the left wrist.

Y/n: *grunts a bit* So much force..

[KaijuTrix attached. New Potential User: Y/n Hashira]

Y/n: *looks at the wrist drive* KaijuTrix.. not a bad name.

[Approval Mode Engaged]

The man then felt a sharp pain as the KaijuTrix started to infuse the pure energy of Hollow Earth Itself into his blood. The radioactive properties of the said energy made Y/n feel instantly sick as he dropped to the ground on one knee. Blue glowing veins started to crawl all over his body.

Blue electricity then emitted from the device as Y/n was electrified all over his body..

Henry: Come on, Mr Hashira.

Emma, Alice and Felicia look on with worry, seeing their commander being in pain.

Y/n continued to be electrified as he tried to get up and resist the immense power of the device. As soon as the Hollow Earth energy reached is heart, Y/n completely tensed up as he dropped to the ground as the energy proved to be to much for his body.

Emma: *panic* Y/n!!

Even though the general looked stotic and uncaring of his son, inside..he is immensely worried for his boy

General: *sighs in disappointment* Another Fucking failure. And my son paid the price for it.

Henry looked on with a pleading look, hoping that his friend is alive..

Dr.Richard: G-General.

Alice, Emma amd Felicia was intensely worried for Y/n, hoping that he is not dead. After a few moments, that's when everything changed.

Y/n's eyes instantly opened up as they glowed white for a few moments before returning to his normal brown color..

Y/n: *groans* Would you all relax?

Much to literally everyone's shock: Y/n started to move. He slowly got to his feet as the KaijuTrix started to speak.

[DNA Signature acceptable.]

Y/n looked at the KaijuTrix on his wrist with amazement..

Y/n: Well, I'll be damned.

General: Son of a bitch...the thing is fully compatible with him.

Henry: Yeah! I knew you would survive this, Y/n.

Y/n: *chuckles* Sounds like you have doubted me?

Dr.Richard: The KaijuTrix has a holographic interface, where a holographic circle is shown, with the top half having Kaiju faces..at least what we thought they were.

Y/n: Is that so..

Dr.Richard: Give it a try.

Y/n pressed on the front sphere part of the device has a holographic wheel popped up..

*This is what the selection wheel will be like. The red selections are the ones that are currently unlocked*

Y/n: This is unreal..

He sees a choice that says: Giant Mimicry.

Henry: Try tapping into one of the selections available to you.

Y/n: Wouldn't it be better to test this outside in a more larger area?

General: He does make a valid point. This space seems small, especially if my son can change his size into that of a Kaiju.

Dr.Richard: Okay, then. I do have a containment area with a Kaiju that he can fight. I can give you the coordinates and we'll be ready to fly.

General Talon: Well..i do wish to see wht my son can do.

Y/n: Then what are we waiting for?

[Timeskip]
Y/n, his father, his squadmates and the scientists are flying in an Osprey the military group originally flew in from..

Y/n was looking over the KaijuTrix on his possession as he scrolls through the selection wheel and sees the current list of Kaiju avaliable for him to use:

Godzilla
Kong
MUTO

Y/n: Kong?

Emma: Say Y/n.

Y/n: Yeah?

Emma: I was wondering something. Have you ever thought of me, Alice and Felicia of anything more than just  your squad?

Y/n: Personally..I think you three of one of my closest friends so far.

Emma: You really think so?

Y/n: Of course.

Alice: *wraps herself around his neck* I didn't think you see us as close friends.

Felicia: You really value us that much, huh?

Minutes later, they arrived in a heavily guarded Containment Area meant to imprison Rouge Kaiju for study..

Y/n: So this is the arena..not bad.

He then looks at his reflection of the new bodysuit Dr.Richard has him put on..

*pre-armor bodysuit that grows with you when growing to kaiju size*

Y/n: Dr.Richard said that this bodysuit can change with me when I use my Kaiju form. Let's test that.

Y/n tapped the Sphere as the Holo-wheel popped open and he first activated the Giant Mimicry to grow giant size. He then switches selections to showcase the Kaiju list. As soon as Y/n swiped the Godzilla Choice into the Codon Stream, his entire body started to convulse.

His eyes turn yellow as his hair began to grow longer and change color, cycling between different shades of blue. His bodysuit has now morphed into clothing that is now contrived of a sleeveless jumpsuit with the design looking similar to Godzilla's scales, with black boots. The veins in his body glowed neon blue, radiating with power..

Felicia: Holy damn.

Y/n looks at his new form and the power that surged within himself..

Dr.Richard: This..this is phenomenal..

Henry: *loud speaker* How do you feel, Y/n?

Y/n: Energized..

Dr.Richard: *smirks* If you feel so strongly about that power, then how about a challenge?

The head researcher then pulled a lever from his station as an alarm rang out, making most people shake up. A large gate was slowly opening in front of the Hybrid Kaiju as one of Y/n's squadmates spoke..

Alice: W-what is that?.

Dr.Richard: A Kaiju we managed to contain in this Area.

General Talon: And what kind of Kaiju did you capture?

Dr.Richard: One that looks similar to a Werewolf. Titanus Mori.

Y/n hears growling as the gate opened..well, was bashed open. The creature was revealed to be akin to a werewolf, but it appeared to have forestation all over it's body with trees, rocky areas and vines..

The Werewolf Kaiju looked around until it locked eyes at Y/n. It growled seeing another Titan at it's sight..

[Only Titan Speak here] *you and the Werewolf Titan are make growling and snarl noise in the human's hearing, but you can speak fine like you know how to speak kaiju]

Mori: You..why do you reek of Human?

Y/n: Because I'm half human, obviously.

Mori: You're presence disgust me..

Y/n: Wow..racist much?

Mori: You're not worthy of being one of us.

Y/n: Are you gonna shut your Maw or do I have to do it for you?

Mori growled before he bellowed out a roar as he runs at Y/n. The hybrid human then make out his own roar before running at Mori..

Both of then charged at one another as they clashed at one another. Y/n gave Mori an uppercut to the bottom jaw, before he grabbed his ankles and threw him across the arena.

Mori crashed onto a wall, yelping in pain. He looked up to see Y/n charging and before he can do anything, Mori shot vines from its arms as they got to work, binding him in most places.

Y/n: *struggles a bit* Trapping me, huh?

Mori: Shut up and die!!

He pulled Y/n towards him, with his canines ready to lacerate his neck open. Y/n quickly used his momentum to dodge and give the Werewolf Titan a sharp kick to his cranium, making him yowl in pain..

Mori: Damn you..

Y/n then ripped out of the vines still ensnared onto himself as Mori tried to use his maw to chomp onto Y/n's neck to rip out his throat, but the soldier quickly kneed it's chin hard, making it roar in pain.

Y/n brought out his claws and viciously swiped at the Kaiju's Stomach, spilling it contients. Mori roared in agony as it got to it's knees and tried to keep it's open stomach closed.

Y/n then charges with his bare hands and gives him a sickening punch to it's lower jaw. The Werewolf Titan tried to bite back, but Y/n clamps it's mouth with his right hand and held it's left arm from trying to see him as he laid down a load of punches to it's face.

Mori broke free from the assault, and tried to bite down on the KaijuTrix user, but Y/n gave it a swinging hard closed fisted punch, grab the top of it's head and held it back while holding the bottom jaw.

Mori roared angrily one last time before Y/n with his enhanced strength pulled the bottom jaw down so hard, brutally ripped apart, splitting it in half to the waist and exposing its organs.

Everyone stood speechless of Y/n beating his first Kaiju

General Talon: Hmm..very creative.

The mangled deceased corpse of the Werewolf Titan fell down on the ground as Y/n stood victorious of the outcome as he roared into the skies. After he finished his victory roar, he breathed a bit.

Y/n: *pants* heh..not bad.

Henry: Yeah, about that..

Y/n turned to his father and everything, rubbing their ears in slight pain.

General Talon: Kid, I know you are proud of the fight you did, but please warn us with that roar of yours.

Y/n: *sweatdrops; nervously laughs* Sorry, sorry. Didn't know what came over me.

Alice: That fight was amazing!!

Emma: You are definitely strong now.

Henry: You could even rival Godzilla himself in power

Y/n: I highly doubt that.

As everything was still marveling at Y/n's newfound strength and power, Alarms stated to raise..

Y/n: What is that?

Random Worker: A unknown energy spike emerged in our arena. Wait..*looks at the readings* It appears to be..coming towards Mr Hashira in front of us?

Everyone then turned to Y/n, as the man himself felt a strange energy near him. He turned to see an unknown portal appearing out of nowhere..

Y/n: What in the hell....

Y/n felt his left arm move on its own
as the KaijuTrix started to draw itself and it's user into the gateway.

Y/n: The fuck?!

He tries to pull himself away from the portal, which isn't doing much.

General Talon: What is going on?!

Dr.Richard: That unknown portal is dragging your son into it.

Y/n then dug his right hand into the structure of the arena to try and keep himself from flying into the portal. However, the strong gravitational pull of the unknown gateway proved too much, even for his large Kaiju form.

The structure he was holding onto broke apart, causing the soldoer to yell as he was pulled into the portal before it closed.

Alice, Emma and Felicia: Y/N!!

Henry: Buddy!!

General Talon: Where did it take him?!

Dr.Richard: W-we don't know. It just showed up out of nowhere.

Random Scientist: Sir, were trying to get a lock on on his last signature.

Henry: We need to try harder. There's no telling where that portal took my friend.

The general looked on with an actual worried loook instead of his regular stotic. He already lost his wife/Y/n's mother back when Y/n was 10. He wouldn't be able to handle it if Y/n was gone forever too.

Alice, Emma and Felicia looked on very troubled of Y/n's sudden disappearance..

Girls: Y/n...

[With Y/n]
He was flying through the unknown portal at a very fast rate.

His unwanted flight in this gateway began to make its end as the KaijuTrix forced y/n's left arm to point forward as a blue ray of energy was shot towards another portal that appeared in front of him. As soon as he goes through it, Y/n instantly feels drowsy as his vision began to fade.

Y/n: Ughh....