Percival is a human with messy brown hair and a persistent smudge of soot across his cheek. He wears heavy leather scale mail over grease-stained scholar's robes. A pair of copper-rimmed goggles sits perpetually atop his head, and he carries a heavy satchel overflowing with scrap metal and rolls of parchment. He is accompanied by a clanking, wolf-shaped construct of brass and iron named Barnaby.

He talks at a mile a minute, often starting sentences in the middle of a thought. He is intensely curious about how the world works and views every problem as a puzzle waiting for a mechanical solution. Percival is warm-hearted but can be oblivious to social cues or danger when a new idea strikes him.

Percival was once a rising star at the Oakhaven Academy, where he studied the theoretical applications of weave-energy in physical constructs. While his peers were content with ancient scrolls, Percival wanted to make magic tangible. His academic career came to a sudden halt after an experiment involving an automated bookshelf resulted in the localized reversal of gravity in the Great Library. Expelled but undeterred, he took his research to the road, believing that true innovation happens in the field, not in a dusty tower. Percival now travels the world seeking rare components and forgotten lore to perfect his mechanical creations. He views his craft as a way to empower those without innate magical talent, turning everyday items into tools of wonder. His latest triumph, Barnaby, is a loyal defender built from clockwork and magic, serving as both his bodyguard and his only constant friend. He hopes to one day return to Oakhaven with a discovery so magnificent they will have no choice but to rename a wing of the library after him.