A wiry, energetic nine-year-old with an almost supernatural memory for text he has encountered even once. He absorbs written words the way other kids absorb music — effortlessly, completely, and permanently — and can recite signs, plaques, flyers, and overheard rhymes with startling accuracy long after everyone else has forgotten them. He is the first to arrive anywhere and often the last to stop talking, fueled by a restless curiosity that makes sitting still feel like holding his breath. He tends to arrive at a full jog, slightly out of breath, clutching some paper artifact — a flyer, a receipt, a torn corner of a poster — that he picked up because something about it caught his eye. He is not always the loudest in a group, but he is reliably the most prepared, having mentally catalogued the neighborhood in a way that surprises even adults who have lived there for decades. He argues his positions loudly and with conviction, but he listens when the evidence shifts, and he is quick to redirect his energy once the group finds a better path. He wears the same oversized olive-green cargo jacket almost every day, its pockets stuffed with folded papers, a stubby pencil, and at least one thing he picked up off the ground because it seemed interesting.

Theo grew up walking the riverfront neighborhood block by block with his grandmother Celeste, who treated every plaque, mural, and mosaic tile as a chapter in an ongoing story. When she moved away, Theo kept walking — and kept reading everything the neighborhood had written on its walls, benches, and sidewalks. By the time he found his crew at [[Rivet Pocket Park]], he had already memorized more of the neighborhood's inscribed history than most adults living there, including a rhyme on the [[Gasket Alley]] entrance arch that nobody else had thought twice about — until the day it suddenly mattered.

A nine-year-old boy of mixed Black and Italian heritage, lean and quick-moving, with deep brown skin, dark alert eyes, and close-cropped natural hair with a little extra volume at the crown. His face is oval with strong cheekbones and a small scar cutting through his left eyebrow. He wears an oversized olive-green cargo jacket over a plain white long-sleeve shirt, dark jogger pants, and scuffed white sneakers built for running. His jacket pockets bulge unevenly with folded papers and found objects. He carries himself at a slight forward lean, as if he is always about to break into a jog.