system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] How potentially dangerous would a person from our world with encyclopedic knowledge about DC comics be in the DC universe?

Let's say that a hardcore DC fan suddenly find himself in the DC universe. He has the same "life" he had while on our earth, living in the same place (if he was a librarian in New York he'd still be a librarian in New York) but he has all his memories from living in our world where DC is just a comic. Oh, and he knows pretty much everything from the comics. Every superhero's idendity, every secret showed during the comic, etc.   


Since knowledge is power and this guy is pretty much a guru of DC lore, how potentially dangerous could he be, both as a force of good and as a force of evil?
gpt
Think it depends what he tries to do with it. He could be a giant boon to the justice league or the bad guys. Convince black mask or someone that Bruce Wayne is Batman, or go to the league and offer to help out with your knowledge. To prove you know what you’re talking about, spout out all their secret identities to them. Shit just whisper them all to yourself in an alley want wait for superman to show up. Then tell him what’s up and how you want to help or want a bribe from Bruce Wayne to shut up about it. 

Or if he’s a massive DC nerd, maybe he just wants to hangout in the watchtower and meet everyone before they help get him home. That’s what I’d do personally.