Want to build a diorama with a mad scientist theme. I’m scratch building a future looking machine that I’d like to have a tiny bit real arc jumping between a couple points. Don’t need anything instant but maybe an arc would be possible every 10-15 seconds till the power is cut. Just for show ,appreciate any ideas

 

Look up Wimshurst machine. Also, see Jacob’s Ladder.

 

I know this is overkill, but look at the one I made for a fellow...
http://www.sadarc.org/xenforo/upload/index.php?threads/learn-arduino.261/page-5#post-1990
It can play music

 

If you get shocked and knocked on your a** I call that the power of comedy.

 

Look up carbon arc lamps, easy to make one.
https://www.instructables.com/Carbon-Arc-Lights/