I collect everything in the One Piece world.

Others go to sea for wealth, fame, or power.
Mosen went to sea to fill his damned illustrated collection.
"The curve of this potato chip is perfect, I'll save it!"
"The shape of this wave is rare; I'll collect it!"
Having been transported to the world of One Piece, Link becomes a Devil Fruit user who collects Devil Fruit abilities.
At first, he only regarded it as a mobile warehouse, which collected all kinds of useless "beautiful moments".
Until one day, when he turned a bullet into a sticker that flashed a dangerous red light and said "Bullet Released," a whole new world opened up before his eyes.
The sharpness of his strikes, the domineering pressure, even the abilities of Devil Fruits... everything tangible or intangible "state" on this sea is his potential treasure.
As a result, the art style gradually became bizarre:
He "collected" the legendary execution platform in Loguetown.
He "collected" the Poneglyphs under Robin's dumbfounded gaze.
"Whitebeard's shockwave and tremor abilities, stop!"
"Akainu's Hellhound and Magma abilities, withdraw!"
"Kizaru's light-speed kick and his 'glint' ability... that's a bit fast, wait for me!"
This book is also known as: "Battle? I'm just supplementing the encyclopedia", "Good heavens, someone even dares to put Conqueror's Haki in their pocket!" and "About the fact that my captain only wants to collect his collection".
[Adventure, harem, no system, Devil Fruit development, neutral to slightly righteous stance, kills both rotten Marines and rotten pirates, Celestial Dragons are destined to die.]