Roy Amos, Marine Headquarters Captain, commander of the Custody Unit warship 'DT-31'.
It is said he comes from the West Blue, joined the Marines at the age of twenty, and has been serving for eight years now.
His performance in the physical tests during enlistment at a Marine branch was mediocre, but his strength began to advance by leaps and bounds after participating in the capture of the West Blue Devil Fruit user pirate, 'Captain Tora the Rhinoceros'—this is not surprising, as many Marine officers began to show their true potential after encountering a powerful enemy.
After that, he was specially recruited into Marine Headquarters, and after passing the headquarters' recruit assessment, he voluntarily applied to serve in the Custody Unit.
—The above is what the members of the Custody Unit know about Roy Amos.
But in reality, what no one knew was...
Roy Amos's true identity was actually that of a visitor from another world.
However, there was one thing the Marine members were indeed right about.
And that is, Roy truly had his own sense of justice.
"Ice-cold cola is justice!"
Roy exclaimed with satisfaction as he happily sent a slice of pizza and a gulp of ice-cold cola into his stomach.
At this moment, he was just looking at the hourglass on the table in front of him.
Just then, the last grain of sand fell.
And in his ear...
[Paramecia-type: Strength-Strength Fruit has been added to the Fruit Encyclopedia, current level LV1]
As such a voice sounded, the translucent screen of light in front of him also changed.
It gradually transformed into a translucent book.
And at this moment, on the pages of the book, there were various Devil Fruits of different shapes.
[Paramecia - Cage-Cage Fruit - LV1]
[Zoan - Ox-Ox Fruit, Model: Rhinoceros - LV1]
[Zoan - Dog-Dog Fruit, Model: Dalmatian - LV1]
[Logia - Glint-Glint Fruit - LV1]
[Logia - Magma-Magma Fruit - LV1]
[Logia - Chilly-Chilly Fruit - LV1]
And on the newest page of the book, [Paramecia - Strength-Strength Fruit - LV1] had just finished being inscribed.
Then, the book closed.
On the cover of the closed book were written two words—[Fruit Encyclopedia].
[Holder: Roy Amos]
[Current Encyclopedia Fruit Types: 19 (Paramecia-7, Zoan-7, Logia-4, Special Paramecia-0, Mythical Zoan-1)]
[Number of Fruit Slots: 2]
[Currently Equipped: Ox-Ox Fruit, Model: Rhinoceros LV1, Human-Human Fruit, Model: Daibutsu LV1]
[Current Belly Held: 41,130,000]
"The Fruit Encyclopedia has finally collected nineteen Devil Fruits... I only need one more to unlock the third fruit slot, and this 'Strength-Strength Fruit' is a pretty useful ability!"
"This trip wasn't a waste."
And the words Roy was muttering in his heart at this moment were undoubtedly something only he could understand.
That's right.
As a transmigrator, Roy also had his own system.
It was the 'Fruit Encyclopedia' he was looking at right now.
As the name implies—this system was related to the unique product of the pirate world, the 'Devil Fruit'.
The Fruit Encyclopedia itself had two main functions.
The first function was collection and use.
As long as he got close to a fruit user and spent some time with them, he could record their Devil Fruit into the encyclopedia.
The recording speed would increase when the user used their ability in front of him.
After obtaining an ability, he could use the corresponding Devil Fruit power through the fruit slots in the encyclopedia.
He started with only one fruit slot, and an additional slot would be unlocked for every ten Devil Fruits collected.
Of course, if Roy directly obtained a real Devil Fruit.
He could absorb it to directly gain the corresponding Devil Fruit ability at LV3.
The encyclopedia's second function was the enhancement of fruit abilities.
After a fruit was recorded in the encyclopedia, its base ability level was LV1.
Subsequently, Roy could spend a sufficient amount of Belly or treasures of equivalent value to strengthen and raise the level of his fruit abilities.
In addition, Roy could also spend a smaller amount of treasure to temporarily unlock a certain level of a fruit's ability—the required amount was about one-third of the normal unlock cost, but it only lasted for one hour.
Furthermore, perhaps because Roy hadn't actually eaten the Devil Fruits.
The abilities he obtained were not constrained by seawater or Seastone.
As for his own golden finger, Roy's assessment was very simple.
"Broken!"
That's right.
He knew very well that the effects of the Fruit Encyclopedia were terrifyingly powerful.
It allowed him to use multiple Devil Fruit abilities without being afraid of seawater or Seastone.
This was already a clear path straight to the very top of the world.
Don't listen to Kaido go on about 'Haki transcends all'; wasn't he himself a user of a legendary Devil Fruit like the [Fish-Fish Fruit, Model: Azure Dragon]?
So, the question arose.
In this vast sea, where was the safest place to obtain a sufficient number of Devil Fruits?
For Roy, the answer was simple—the Marines.
As a behemoth backed by the World Government, holding back the Great Pirate Era from completely spiraling out of control.
The number of ability users within the Marines, and the number of users they could come into contact with, was bound to be the highest.
Therefore, Roy chose to join the Marines and voluntarily selected the unpopular 'Custody Unit'.
And facts proved that his choice was the right one.
In these eight years, by coming into contact with ability users within the Marines and occasionally escorting criminal ability users, he had already obtained a full nineteen Devil Fruit abilities.
Among them were even the Logia abilities of the current three Admirals, and even Fleet Admiral Sengoku's Mythical Zoan 'Human-Human Fruit, Model: Daibutsu'—a top-tier Devil Fruit ability.
It could be said that in terms of accumulating fruit abilities.
Roy had already built a solid foundation.
So now, there was only one problem he faced.
And that was...
"I need to find a way to make money."
His Excellency, the Marine Captain, thought to himself.
Yes.
Just as mentioned before, his fruit abilities required Belly to be enhanced.
The specific prices varied greatly depending on the type of fruit, but they all shared one common characteristic—the stronger the fruit, the more expensive it was.
Based on Roy's summary so far, upgrading ordinary Paramecia and Zoan fruits to LV2 required around 50,000,000 Belly, LV3 required 200-300 million Belly, LV4 required 1 billion, and LV5 fruit awakening generally required over several billion Belly.
Logia types were even more exaggerated. Upgrading the ordinary Smoke-Smoke Fruit to LV2 required 300 million Belly, LV3 directly needed 1.5 billion Belly, LV4 required 5 billion, and fruit awakening was an astronomical figure of over 10 billion.
As for top-tier Logia fruits like the Magma-Magma Fruit and the Chilly-Chilly Fruit, the enhancement prices were even higher.
By the way, Roy's monthly salary as a Marine Captain was about 300,000 Belly.
In his eight years in the Marines, even with allowances and rewards from escorting prisoners, he had only saved up a little over 40 million Belly.
"I'm a model young man who doesn't smoke, doesn't drink, and whose only hobby is drinking a bit of cola, yet it's still so hard to save money... Hic!"
Roy hiccupped and sighed.
He was genuinely troubled by this.
"No money!"
Who would have thought that the thing he worried about before and after transmigrating would be the exact same thing?
"If it really comes down to it, I'll have to leave the Marines after collecting 20 Devil Fruits. I could become a bounty hunter or something. Although I'd have to travel all over, at least the speed of making money would be much faster than in the Marines."
"And although all my current fruit abilities are at LV1, if I can unlock the third fruit slot, it should be enough to get by in the first half of the Grand Line, at least."
Roy calculated in his mind. But just at that moment...
"Boom!"
The ship's hold suddenly began to shake violently, and cries of alarm came from outside.
Roy quickly protected his ice-cold cola and shouted angrily, "What's going on? Who's at the helm... Right—Hans! Are you trying to get fired!?"
Shouting, he quickly finished the rest of the cola in his cup, then opened the door and walked out of the hold.
Then he saw a chaotic deck, and his marines holding guns and firing.
The direction they were aiming was into the sea.
Under the moonlight of the dark night sky.
A colossal creature was emerging from beneath the sparkling surface of the sea.
It had the head of a lion, the body of a fish, and was dozens of meters long.
Its huge eyes glowed in the darkness like burning embers.
"Captain Roy, it's a Sea Beast—a large Sea Beast is attacking us!"
Sergeant 'Fal' came up to Roy and reported anxiously.
"A Sea Beast?"
Roy raised an eyebrow.
As a Marine unit active in the Four Blues for a long time, the bottom of the Custody Unit's warship was of course lined with Seastone.
Therefore, under normal circumstances, Sea Beasts and Sea Kings wouldn't even notice the warship's existence.
But accidents could happen—for example, if a coastal Sea Beast or a small, shallow-sea Sea King got too close to the surface, they might discover this 'iron lump'.
"Yes! It seems our luck is really bad."
Fal looked like he was about to cry.
But...
"Bad luck? Isn't this great luck?"
Roy interrupted him. "I remember that Sea Beast meat is very valuable!"
"...Wh... What?"
Fal was a bit slow to react.
But Roy didn't answer him. "Everyone, cease fire! If you ruin the best cuts of meat, you can just wait to die!"
All the marines on the warship were stunned.
But as soldiers, they still subconsciously stopped shooting.
"Sir, you..."
Someone started to ask a question.
But before they could finish, they saw Roy move.
"Boom!"
He bent his knees, and then... leaped violently!
The immense force even caused the entire warship to noticeably tilt for a moment.
And under the gazes of all the marines, Roy's figure shot towards the giant Sea Beast at high speed.
Cries of "Captain Roy!" erupted from the marines.
But in the next moment, their cries of alarm turned into shrieks of horror.
Because at that moment, the Sea Beast had clearly noticed Roy.
"Roar!"
Its massive head let out a low roar and then charged towards Roy with immense force.
"It's over!"
"If he takes that hit head-on... even the Captain..."
"Prepare for rescue! Prepare to rescue the Captain!"
The marines were in a near-panic.
But just a moment later, the scene they witnessed made their eyes nearly pop out of their sockets and their jaws drop wide enough to dislocate.
Because under the moonlight.
The Marine Captain flew past, his 'Justice' coat fluttering in the wind.
He bent his elbow, and then... clenched his fist!
In the moonlight, all the marines saw his thick arm, which looked as if it were cast from iron and steel!
The muscles beneath that arm were knotted like steel cables.
[Currently Equipped Fruit-1: Ox-Ox Fruit, Model: Rhinoceros LV1 - Weak fruit ability, grants the body of a rhinoceros, with physical strength and muscle density far exceeding that of a normal human]
[Currently Equipped Fruit-2: Strength-Strength Fruit LV1 - Weak fruit ability, allows muscle strength to be amplified by 5 times]
Many people knew that Zoan-type Devil Fruits could grant their users powerful, beast-like bodies.
Gladiator Antolia also knew that his Strength-Strength Fruit could greatly enhance a user's muscles.
But, if a person simultaneously possessed the base physical stats provided by a Zoan Devil Fruit and the muscle amplification provided by the Strength-Strength Fruit... what would the effect be?
This moment was the answer to that question.
"Boom!"
Roy threw a punch!
The gale force winds driven by the immense power even pressed a huge 'gully' into the surface of the sea in front of him.
The next moment, fist and Sea Beast head collided.
And all the marines saw it.
That colossal, hundred-meter-long Sea Beast... was sent flying by Roy's single punch!
"Awooo!"
It let out a pained cry, and upon landing on the sea surface, it was immediately knocked unconscious.
And Roy's figure, amidst the marines' cries of "Eh-eh-eh-eh-eh?!", landed on the Sea Beast's head.
That's right.
This was the reason why Roy wasn't too anxious, even though all his fruits were still at LV1.
Because...
"Stacking Devil Fruits isn't as simple as one plus one. As long as you have a sufficient understanding of enough Devil Fruits, even LV1 abilities can unleash unimaginable power!"
Roy whispered in his heart.
"And in this world, nobody understands Devil Fruits better than me!"