House of the Dragon: TV Show vs. Book Differences
8 Ways "House of the Dragon" Puts a Spin on Plot Points From the Book
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In "Fire & Blood," Princess Helaena is a deeply tragic minor character. Married off to her brother Aegon, her most notable role comes later into the civil war when she is forced to make an impossible choice and winds up meeting a devastating fate herself.
"House of the Dragon" weaves Helaena into the story earlier. Throughout her appearances, she seems strange and mutters apparent nonsense, but that nonsense almost invariably turns out to be prophetic. So far, she has predicted her brother Aemond losing an eye, the appearance of the dragon Meleys from underground, and the civil war between factions of her family.