User blog comment:PurplePassion20/List of Firsts in Choices/@comment-24378197-20190309060410

ILITW: First book featuring mutually exclusive love interests (Connor and Stacy)

TC&TF: First series where a love interest can die (Tevan)

Edit: D&D: First series where the MC's skin tone affects dialogue, and first series where both of the MC's biological parents are shown.