Jared Hopworth is a Boneturner, a skill that he has learned from The Boneturner's Tale, a Leitner tome. This book is linked to the entity known as The Flesh, as evidenced by Jared's abilities to manipulate bones and the statements he appears in which concern bodies, meat and being consumed by something. This can be either a literal consumption, as in MAG 49, or a consuming desire for a perfect body, as in MAG 90.
Jared was a childhood friend of Sebastian Adekoya. When Sebastian left town to attend university they grew distant, and when Sebastian returned Jared started a campaign of petty terror against him. In September of 1996 at the Chiswick Library, Jared obtained The Boneturner's Tale (MAG 17).
Jared used the Boneturner's Tale to learn the skill or power of boneturning: the ability to remove bones from living people without breaking the skin. It is likely that he practiced on his pet mouse the night he obtained the book; he made his father taller, and gave his mother a smile, which they did not appreciate. Jared also twisted or broke his mother's arm in an unnatural fashion; she quickly returned The Boneturner's Tale to Chiswick Library. Later the same night, Jared returned to the library larger and bulkier than he had previously, with extra limbs and likely full of other people's bones. He took The Boneturner's Tale from Sebastian and fled. It is likely that he was also responsible for Sebastian's death ten years later, as despite no signs of crushing, his body was twisted and misshapen in ways consistent with the effect boneturning powers.
After leaving home, Jared worked a number of odd jobs where his odd appearance did not matter, often getting rid of people. Some 11 years later he had some connection with the Ukrainian mafia. He continued to boneturn in a butcher's shop in Stackwell, taking around 14 victims there to remove their bones and twist them into different shapes. Most of these bones he threw into a glistening, toothed hole in the floor. Eventually, when his last victim, Hector Lerado, died, he butchered his corpse and threw it into the hole as well (MAG 49).
It is clear that he is able to add bones to his own body, leading to the distorted figure that he now is: possessing multiple limbs, and apparently unrecognisable from the photo on his driver's license. He was encountered by Ross Davenport as a gym owner in 2012. Their gym encourages people to push their bodies far beyond their normal limits, including illegal steroid use. Ross encountered creatures in the gym with impossible anatomies - including far too many arms - but is let go by Jared saying that it is "too soon" for Ross to join them (MAG 90); however, fellow gym goer Marie Belandid, a dissatisfied women's bodybuilding champion, expressed potential interest in obtaining a "perfect body".
Despite being an avatar of the Flesh, Jared displays no interest in bringing forth its ritual, as he is unambitious and rather likes the world as it is.
Jared began to receive letters from an unknown source in 2016, in large print on expensive white paper, with details of a name and place or time. While initially skeptical of their value, as the letters were unsigned and he was unsure how they were being sent to him, curiosity led him to take one up on its message: he found Regan Hasnain in 70 Clairmont Gardens, and found that she had extremely good bones: solid, healthy, and they jumped at his touch. Following the instructions given in further letters, which arrived fairly regularly, consistently led him to good things--high quality bones, new friends, or people easily terrorised. Jared began to trust the sender, and did not question them.
At some point between seasons 3 and 4, when the letters asked him to invade the Magnus Archives and assassinate Jonathan Sims (who was not in fact present, as he was mostly dead in a hospital bed for six months), helpfully providing a picture, he brought some friends and squeezed through the pipes, coming up through the floor. However, Melanie King attacked many of the invaders with a knife (likely enhanced by Slaughter powers), chopped some hands off Jared and stabbed him in three hearts; he was afraid and ran away through one of the Distortion's doors, where he remained trapped for some time.
In MAG 131, Jonathan Sims was having some difficulty removing a body part, which he believed would be the best thing to serve as an anchor as he entered The Buried's coffin. He traveled through Helen's corridors to find Jared, offering his freedom in exchange for the removal of one rib; Jared agreed, and also traded his short statement for a second rib, which he described as "a weird one". While the bone removal process is not painful for Jared, it appeared excruciating for the Archivist. Jared left through another door, which Helen opened in an exterior wall some distance above a river.