Dune isn't the easiest franchise to jump into. The books and films contain dozens of key characters, multiple critical factions, and millennia of in-universe history. Fans will either bounce off of those dense concepts or immerse themselves so thoroughly that it alters their brain chemistry. Fixating on the less well-known characters can be a great way to explore a new universe. Take Jamis, for example. He isn't around especially long, but his impact resonates throughout the Dune universe far beyond his death.