Margaery Tyrell
Margaery Tyrell, a character impeccably brought to life by the incredible Natalie Dormer, boasts a unique distinction in the show with her unconsummated marriages. In contrast to the Baratheon family into which she marries, the Tyrells are renowned for their loving and close-knit bonds.
What's intriguing, however, is that Margaery's character, much like Joffrey's, underwent significant aging in the show compared to the books. This decision was prompted by the producers' admiration for Dormer's audition portrayal despite the age disparity. Her portrayal remains a standout in the series.