Inadvertent World Traveler

You are not from here, but maybe you belong and maybe you don't.  Consult the table for the origins of your world walk.

You know a lot of things, sometimes without even realizing it.  This is reflected in your proficiency in the Insight skill, and you also have Advantage in any skill check where your 21st Century knowledge may prove useful whether or not you are proficient.  "Wait a second, guys!  I saw this in a movie once ...!"  Other people may be fascinated by your bizarre and strange knowledge on a number of different topics and react favorably to you, even if they don't fully understand your references.  "Don't even try it, man ... you only get three spell slots per short rest ..."

By studying a person, creature or item for 1 minute, you can make a Insight check to recall some relevant bit of information about it.  For example, suddenly remembering a harrowing D&D session, you cry out "Wait, bro!  Don't put that bag of holding in your Handy Haversack!  You'll kill us all!"

You're from another world, and whether intentionally or not - you left your home world.  You may be involuntarily exiled to this world, or maybe you are fugitive from justice in your world of origin.  Regardless of how you came to be here, you must adapt or die.

You know a great deal about how to use, create, or control technology decidedly different from the way things work here.  Magic may be foreign to you, but energy manifests itself in many ways depending on the laws that govern this world.  When you encounter any item, trap, spell or must identify any creature, you may make a Insight check to decipher or identify it.  You make attempt the same check as a bonus action to anticipate the actions of any creature or person you encounter with a DC of 8 + the CR or level of the creature or person.  If your skill check is successful, you make take your action as a Reaction after the creature or person has acted, or take your action before them as you choose.  "Run! It's going to spew venom ... !"