User blog:PurplePassion20/List of Firsts in Choices

Almost each book/series introduces something new (excluding the first three books that were released when Choices began:


 * Rules of Engagement: Chronologically the first series with multiple points of view throughout (The Crown and The Flame starts as a "dual lead" between Dom and Kenna, then becomes "multiple POV" in books 2 and 3). Also chronologically the first series where the MC has a default name ("Emily" from The Freshman didn't have the default name at first, only in later books).
 * Endless Summer: First "gender of choice lead" series.
 * LoveHacks: First series where each chapter ends with a preview for the next chapter (along with the name of the next chapter).
 * Haunting of Braidwood Manor: First standalone book and first horror-themed book.
 * The Royal Romance: Chronologically the first series to use strong language (specifically, Drake uses the word "bullshit").
 * High School Story: First series with a non-binary character.
 * It Lives: First series where the main characters can die (including the MCs), first series with content warnings and first series with a transgender character.
 * Red Carpet Diaries: First series in which the MC is a celebrity.
 * Perfect Match: First Sci-Fi themed series.
 * Bloodbound: First Vampire-themed series.
 * America's Most Eligible: First Reality TV themed book.
 * Desire and Decorum: First Historical Fiction series.
 * Big Sky Country: First Western-themed series.
 * The Elementalists: First Magic-themed series.