Doc Worth (birth date unknown, probably mid 30s) is a skeezy, back alley doctor that Hanna frequents when his dealings with the supernatural inevitably get him beaten up. His real first name is not mentioned in the comic, but one of the donation incentive comics released by Tessa, featuring a college age Worth and Lamont, reveals it to be Luce. He is tall, thin, and unshaven, and speaks with a butchered Australian accent. His demeanor tends to be rude and abrasive, and he sees no need to help anyone he doesn't care about. As Tessa puts it , "underneath his grungy exterior and antagonistic behavior he really still is actually just a dick."
He comes from a well-to-do family in Australia, but moved to the States with them as a kid. It was there that he met Lamont, who apparently kicked a ball into the Worths' yard, prompting Luce to beat the pulp out of him when he tried to retrieve it. The two remained fast friends after that, albeit with frequent bickering and fistfights. Nowadays, Lamont helps Worth acquire various medical and occult items that he can't get a hold of himself.
Worth did in fact attend medical school for a time, but dropped out before earning any kind of degree, finding rote memorization from textbooks to be a waste of time. After he dropped out, he apparently lost touch with his parents and opened his own back alley business, fully intending to do normal, if not highly illegal, medical work. But then he met Hanna, who was apparently in some sort of ghost induced peril at the time. After fixing him up, Worth became Hanna's go to doctor, introducing him to the supernatural gradually over the years. In spite of his apparent indifference towards the lives and feelings of others, and even his apparent enjoyment of antagonizing people (especially Conrad), he does seem to legitimately care about Hanna's wellbeing, hinting at him perhaps being not so terrible of a person deep down.
Quoted from Tessa
"He is abrasive, loud, crude, and tactless, but lacks the genius to make it all okay. He claims to be a doctor, but he's a medical school dropout and instead seems to have his own office of shady operations where he helps people like Hanna who have no money or option to go anywhere else."