One Piece: The user of the Nen-Nen Fruit, who overturned the sea.

Roy stepped forward and waved a hand in front of the test subject's eyes.

The subject's eyes showed no reaction; the pupils remained motionless, like two dead glass beads.

Roy then used his Observation Haki to sense his mental fluctuations again—

Almost zero, like a stagnant pool, devoid even the most basic fear and pain.

"Can he still understand instructions?" Roy asked.

Gracia shook his head:

"Over the past year, he has endured too many surgeries and drug stimulations."

The nervous system has been severely damaged, and the individual has essentially lost all self-awareness.

However, this isn't a bad thing for the experiment—it has no independent consciousness and therefore won't resist.

Roy was silent for a few seconds, then placed his hand on the subject's head.

The telekinetic energy probed into his brain like tentacles, bypassing the already necrotic nerve areas and directly connecting to the most basic instinctive reflex zones.

"Stand up."

Roy's voice was calm, but his thoughts had been directly implanted into the experimental subject's central nervous system through telekinesis.

The test subject's body trembled.

Then his legs began to tremble slightly, his knees bent, his feet touched the ground, and he slowly stood up from his wheelchair like a rusty machine.

His movements were so stiff they didn't look like a living person, but he did manage to stand up.

A hint of surprise flashed in Gracia's eyes:

"Directly control his nervous system with telekinesis? That's a good idea."

"It can only perform simple commands."

Roy withdrew his hand.

"Too complex won't work; his brain can't handle more advanced instructions."

"That's enough."

Gracia shoved the first Devil Fruit—the Cat-Cat Fruit, Orange Cat Mode—into Roy's hand.

"Let him take this first, and we'll see how it goes."

Roy took the fruit and walked to the test subject.

The test subject remained standing in place, staring blankly ahead, unresponsive to anything around him.

Roy held the fruit to his mouth and simultaneously gave him a very simple command through telekinesis—open your mouth, bite, and swallow.

The test subject's mouth opened.

The fruit pulp was bitten into, and juice dripped down his chin.

The nauseating smell caused the test subject's facial muscles to twitch instinctively, but it was just a twitch.

He chewed mechanically a few times, then his Adam's apple bobbed up and down as he swallowed the fruit.

The lab was silent for a few seconds.

Then the test subject's body began to change.

His bones cracked, his muscles began to swell, and a layer of orange down appeared on his grayish-white skin.

A thick tail extends downwards from the spine, and the ears move upwards, transforming into two fluffy cat ears.

In just over ten seconds, the person transformed into an orange cat over two meters tall.

"Zoan-type Cat-Cat Fruit, Orange Cat Form, Transformation successful."

Gracia was jotting things down in his notebook at lightning speed.

"Subject Number Seven absorbed the first Devil Fruit without any obstacles."

Gene sequence remains stable, heart rate is normal, blood pressure is normal, cell activity is normal...

He looked up at Roy, his eyes behind his glasses gleaming with an almost fanatical light.

"Let this test subject eat the second Devil Fruit!"

Dr. Gracia's eyes were bloodshot, but his hands were steady.

When he placed the Paramecia-type Color Fruit into Roy's hand, his fingers were even trembling slightly, not from nervousness, but from excitement.

"Doctor, your hands are shaking." Roy took the fruit, his tone calm.

"nonsense."

Gracia pushed up his glasses, his eyes widening behind the lenses.

"I've never seen a living person eat a second Devil Fruit before, how could I not be excited?"

Roy didn't say anything more.

He walked up to Subject Seven, a two-meter-tall orange cat sitting next to the experimental table, its tail unconsciously sweeping across the ground.

The orange fur stood out starkly under the harsh laboratory lights. The cat's face was expressionless, its two vertical pupils wide open, as empty as a specimen.

"Open your mouth," Roy commanded telekinetically.

The cat's mouth slowly opened, revealing two rows of sharp cat teeth.

Roy stuffed the colored fruit into his mouth, and the sound of the flesh being chewed was particularly clear in the quiet laboratory.

The juice dripped down the cat's chin onto the ground, emitting the pungent smell characteristic of Devil Fruits.

Swallow.

Everyone in the lab held their breath.

Gracia's fingers hovered motionless above the monitoring keyboard, his eyes fixed on the screen displaying the fluctuating physiological data.

The assistants next to him also stopped what they were doing, and some of them almost dropped their notebooks without even noticing.

One second.

Two seconds.

Three seconds.

The test subject was still squatting there, its orange fur intact, showing no signs of exploding.

"The gene sequence... is stable!"

Gracia's voice suddenly rose in pitch.

"Heart rate is within the normal range!"

There are no abnormalities in cell activity!

Blood pressure is slightly elevated but still within safe limits!

He rattled off the data in one breath, then turned to look at Roy, his entire face glowing.

That kind of fanatical expression unique to scientists even made Roy feel a little uneasy.

"Did it work?" Roy asked.

"It's a success!"

Gracia almost jumped out of his chair.

"Blackbeard's physique can be replicated!"

We did it! We really did it!

Roy didn't rush to celebrate. He walked up to the test subject and used his telekinesis to probe his brain again.

"Demonstrating the power of the first Devil Fruit."

The test subject stood up, and the orange cat's size swelled up again.

His muscles were clearly visible beneath his fur, and his nails gleamed coldly as they sprang from his claws.

The entire transformation process was smooth and fluid, completely different from the stiff, rusty machine-like transformation of the first time—

This test subject seems to have even more control over the Cat-Cat Fruit than before.

"Second Devil Fruit ability, stacked."

The cat's fur began to change color.

First it was red, the whole cat looked like a burning flame;

Then came orange, yellow, green, blue, indigo, and purple—

The seven colors on the cat's body changed constantly, as fast as a carousel.

Finally, the test subject stopped at an extremely bizarre color scheme: the left half of its body was bright green, the right half was fluorescent pink, and the tail had leopard spots.

Gracia laughed so hard he slapped his thigh:

"Good! Good! This ability is so easy to recognize!"

Colored fruits—no problem! Absolutely no problem!

Roy withdrew his telekinetic command, and the cat's color slowly faded, returning to its original orange hue.

The entire process was clean and efficient, with no signs of any conflict of abilities.

In Roy's Observation Haki perception, the two Devil Fruit powers within the test subject were like two parallel lines that did not interfere with each other.

Each occupies its own independent "area," and they keep to themselves.