You were a close friend of Dhaik that got roped into working in monarch with him.

Your special Wrist device: KaijuTrix

This would be the device. It's DNA locked to you, so only you can use it. Once inserted into you, it will inject a compound in your bloodstream that makes your Blood have similar radioactive levels to that of a Alpha Titan, give you immunity to all sorts of Radiation and energy absorption.

Bio: This is made from an unknown dimension that was sent in the World of Kaiju Girls by an unknown person. You managed to find the person and tries to help him, but he refused, knowing that his death was coming.

[Capabilities of the device]

Capture Mode: used to scan Kaiju DNA to add a new DNA sample to in internal Codon Stream or unlock one for use. A function activates from the front part of the KaijuTrix which opens up to reveal an LED that scans a Kaiju's whole body with a light blue holographic laser wave beam. the LED can absorb any part of Kaiju DNA That it touches, where it's blood or saliva

Communicator: A built-in device allowing you to contact people of your choosing, no where you are.

Holographic Viewer: This projects a Holographic motion picture of something you wish to show others.

Revert: Allows you to manually de-transform back to your normal self, but still in your giant form. Doing it twice, revert you to human size.

Dimension Travel: a small blue sphere floats out of the LED(the round part of your device) as it then shoots down on the ground and opens a portal to whatever dimension you choose to go to.

Hollow Earth-based energy Generation: The fuel that powers this Device and why Y/n is enhanced and can live longer. Y/n was also able to charge up blue energy into his hands and feet, allowing him to perform stronger hits.

Kaiju Translator: A built in Translator that allows Y/n to Speak to the Kaiju as they were speaking his language.

Longevity: Due to your DNA being rewritten to the smallest atom, your Lifespan is increased tremendously as you can life just as long as Kaiju.

Giant Mimicry: Y/n can transform into a giant, a humanoid being of prodigious size and strength common in most Kaiju. Most obvious changes are increased size (ranging from relatively normal-sized but big to huge to closer geological scale), strength and endurance.

Radiation Immunity: The user is either immune to radiation or its effects. Astonishingly, the user could traverse areas where normal creatures, would succumb to Acute radiation syndrome. They could simply detect radioactive substances; through its affects alone and without a Geiger counter.

Radiation Absorption: The user can absorb all forms of radiation and use it in some way, as in augmenting their strength, durability and possibly even regeneration of their bodies.

DNA Splicing The DNA of the Kaiju within the KaijuTrix can be utilized together to create custom moves that you think of. It would not give you fusion forms, but you can use both abilities of two kaijus together.

And here's one ability that'll be the ultimate game changer with the KaijuTrix:

Instant Restart. This feature can only be activated in the moment where we get officially killed.

Examples such as: head ripped off, decapitated, crushed, pierced through multiple things, and others..

The feature immediately sends an energy sphere to collect and pick up Ghidorah's DNA Signature(the one from Rebirth of Mothra 3) and brings it to the KaijuTrix. With the DNA Activated, the device sends gold energy(appearing as gold veins on your body or gold energy tendrils to grab whatever body part of you left.) healing the fatal injury you have, or what restoring bones, organs, muscle tissue you lost.

After your body is healed, an electric pulse is shot on your heart, kickstarting it and bringing you back to life. The Limit of this feature is 5 uses, so be vary of the enemies you face.