Adachi Core

Core is a grown man of roughly average height, or a touch taller, standing about a head above his younger sister. He keeps his black hair cropped short, wears round glasses, and dresses in a white coat whose breast pocket carries a pink letter C stitched into it.

By his sister's account, Core is fixated on machinery and loses himself completely once a conversation turns to it. Alongside that engineering passion he is an enthusiastic reader of One Piece itself.

Working as a professional scientist and machine specialist marks Core as a capable and clever inventor. His signature creation is the One Piece Mental Playback Device, a collar that beams One Piece scenes straight into the wearer's mind by manipulating their neurotransmitters, drawing on both conscious and unconscious signals. The device interprets the idea of thinking about One Piece very loosely: when Toriko wore it, merely needing to pee triggered an unstoppable flood of water-themed scenes.

In the story, Core walks Memori to school and crosses paths with the Pirate Club. Hearing them lament Oda's workload, he proposes a switch to a digital workflow even though he personally favors analog methods, sparking a lively debate with Usopp as he argues for folding modern technology into the One Piece world through ideas like livestreaming Roger's execution or crowdfunding the Road Poneglyphs. The talk eventually fades, and on the walk home he agrees with Memori's hunch that he and Usopp would hit it off.