Neal Burke (pg): White Collar; Only seen in his fandom as a baby, Neal is the future teenager of Peter & Ellie, who's mostly a good kid but has some of his namesake's tendencies. He's an Intern in the Security department.
Marcus Flint (flintmark): Harry Potter; A grumpy world traveler & smuggler, who is more comfortable with his fists than his wand. He works as a Combat Field Agent.
Derrick Hill (derrickhill): Enlisted; A middle brother and Army soldier from a short lived sitcom. He works as a photographer for Atlantis News.
Miss Rosalie (rivers): The Lives of Christopher Chant; A talented, no-nonsense sorceress. She works as the assistant to the Chief of the Magical Department.
Daniel Jackson (ologist): Stargate SG-1; A culture nerd & prolific polyglot who travels through wormholes to other planets on behalf of the US Air Force. He works as a Diplomat & Linguist.
Delilah Moon (leap): Harry Potter; Merely a random name in her fandom, Delilah is a Hufflepuff and well-meaning, friendly gossip. She works as a Reporter for Atlantis News.
Ginny Weasley (onlygirl): Harry Potter; Future wife of the boy who lived, Ginny is currently single and a chaser for the Holyhead Harpies. She works as a Magic Field Agent.
Connor (deviate): Detroit: Become Human; The Android sent by CyberLife. Connor is a deviant (sentient Android) who has adopted a couple of Marvel's "science bros" as his family (re: Tony Stark, Peter Parker). He works in Security.
None of mine have any problem with canon puncturing. Derrick and Delilah are the ones of mine who are usually aware of other fandoms. Unfortunately, I am not familiar with The Magicians, so they wouldn't know Margo, but Rosalie's curious about other types of magic because of her job, if nothing else; and Delilah's nice to everyone when she's not dealing with her own emotional crises.