Hussie got inspiration for making the trolls before he even knew he was going to have trolls in the story by the "Little Monsters" movie poster John got for his birthday. I don't have a source because I have the Homestuck book and it's in the author notes, unless I can take a picture of it?

Yeah I guess taking a picture of it and adding it to the post would count as a source.

Unless someone else knows a better way.

-Mod L