good question....
seconding victoria again because she is always right: I would teach a class about the more real life meta influence Homestuck has had on internet culture and storytelling! many, many, MANY pieces of media wouldnt exist without it breaking the boundaries of how a story can be told on the internet, and not just undertale/deltarune. even to this day there really isnt a piece of media that does what Homestuck did- it was entirely unique and special in its storytelling format. it would be a great way to teach about what Flash was, as well, and give a brief history of how it shaped the early internet!