There are other characters in the realm of Forever knight that don't appear as frequently, or aren't as central, as the characters mentioned before. But they are interesting nonetheless and mentioned in stories ever so often, so it's worth to know them.

Urs - Vachon's vampire child. A delicate 18th century New Orleans girl who was brought across when she had lost all her hope in life and asked him to kill her. Her unhappy existence as a vampire is comparable to Nick's. In the modern times, Urs works as a dancer at the Raven.
Screed - Vachon's companion and friend. He is a carouche (a lower form of vampire that only feeds on animals) with a passion for rats. He lives in a sewer and talks in a thick cockney accent that suggests he had been a sailor in his mortal life.
Capt. Joe Stonetree - Nick's commanding officer in the first season. A cool and mysterious professional who's manners show he has handled Nick in the past and knows how to deal with the difficult detective. He also knows how to cool down Schanke when it comes to it.
Capt. Amanda Cohen - The captain in the second season. She is the most no-nonsense captain of them all. She never gives a hoot about Nick's endless odd habits or Schanke's endless complaints. Instead, she focuses on reminding them what their responsibilities really are.
Capt. Joe Reese - Third season captain, who has to deal with Nick and Tracy, and a consistently uncooperative water cooler. Captain Reese was the only captain that somewhat came into contact with Nick's other side by meeting LaCroix. He is always a little too stressed out and too worried about having the commissioner's daughter under his command
Divia - Lucien Lacroix's master and biological daughter who brought him across when Vesuvius erupted in 79 AD. She was the mortal child of LaCroix and the brothel mistress Selene, and was brought across by the ancient vampire, Qua'ra. By turning LaCroix into a vampireshortly after, she became his sire as well as his daughter, and was slain by him after her evil nature was revealed to him.
The Inca - Vachon's vampire twin. He spent centuries chasing Vachon to make him take responsibility and fulfill their master's wishes. They finally met in Toronto after a very long time.
Grace Balthazar - Natalie's assistant pathologist and chummy girlfriend who likes to tease her every now and then about her relationship with Nick. She is a good listener though, and a great confidante when it comes to girlish talks.(Picture courtesy of Nichole A. Knight)
Miklos - Raven's bartender and Janette's devoted employee. He knows his customers and their special drinks and always serves the right stuff.
Alma - Raven's sexy vampire hostes with a passion to bite. She's famous for once luring an unsuspecting Schanke into one of her deadly traps.