Buggy is a Mystery Person!
Disclaimer: I do not own One Piece and acquire no monetary or other gain from this fanfiction work. I merely speculate on a wonderful work of art and story that, thankfully, does not seem to have an end in sight quite yet.
Luffy finally reached the pinnacle of Raftel, the giant stone platform with a stone altar at the very far end. Luffy slowly approached the platform, curious at the likeness of the stone statue to a human woman who looked an awful lot like Princess Shirahoshi. He was picking his nose, staring at the pretty woman as he tried to remember the mermaid princess's name, when he heard the sound of something flying towards him through the thick mist that surrounded the island.
He was, therefore, not surprised when a body landed in front of the statue, hit the stone platform hard, and rolled clumsily to a stop in front of him. The lump of person lying on the stone was tangled helplessly in a large cloak, and muffled curses and frustrated sounds emanated from the lump of wriggling cloth until it rolled again and a human body freed itself.
It looked an awful lot like Buggy the Clown. The blue hair was tied back in two pigtails that jutted out of the top of a Captain's tricorn with the symbol of the Buggy Pirates on it, the red clown nose was prominent in the middle of a scowling face, and the face paint confirmed the clown persona.
The problem was that the clown was a child – no more than twelve or thirteen years of age. Buggy – last Luffy had checked – was at least as old as Shanks.
"Who the hell are you?" Luffy asked.
"I am the Great Buggy!" the child yelled enthusiastically. The high-pitched voice seemed to shock the child, and he frantically checked over his body, even yelling "Chop-chop Cannon!" a couple times as though trying to separate his hands from his body. No devil fruit activated, though, and after a few moments the child slumped into depressed petulance. "I was the Great Buggy the Pirate Clown," the child moped. "Now I gotta start all over."
"Huh?" Luffy replied. "Buggy isn't a kid."
"I wasn't. Then you got on Raftel and I got sent back here," the child replied. "Damn you, you flashy bastard! I liked my life!" the child spat, turning depressed to furious in a fraction of a second.
Luffy was still confused, but he could now clearly see the traces of Buggy in the kid, aside from the obvious appearance. However, he could only think of one response to this information.
"Huh?"