A foist of massive talent.
John is an incredibly skilled Foist. He has a casual way of looking at things, and when making a getaway, almost always leaves a calling card. That would be a grey card supported by a small prop, which always says: Better luck next time! Nobody has ever caught him in a heist, and probably never will. He works for the Rogue, and will always complete his mission, especially when the Rogue needs something specific.
John carries twin Kunai, both of which are laced with a lethal venom that he keeps in a small pouch on his belt. Aside from those, he also carries pinpoint daggers, also known as throwing needles. He often uses these to disable a target without killing them or harming them severely.
John can run very fast, often evading even the quickest of police forces, and he can turn a good variety of things into a hiding place. He can also climb things and hide very quickly, giving him the advantage over most pursuers.
Growing up, John knew he had talent. He was faster than most people he knew, and he always won at hide-and-seek. After a terrible accident involving a massive fire and him losing his whole family, he turned to a life of crime, not knowing what else to do. The Rogue noticed his efforts and growing name in the city, so the Rogue took John in as a Foist, and John has been working for the Rogue ever since that day, his skills growing with each passing mission.