Kirino Kousaka

Kirino Kousaka is the main heroine of the series. Kirino is Kyousuke's younger sister and the youngest of the two siblings of the Kousaka family. She is an overachiever who seemingly lives a perfect life and is idolized by almost everybody. However, she keeps a big secret from her family, she is an avid otaku and a fan of adult-rated games, especially those involving brother-sister dynamics. Kyousuke's discovery of this secret led Kirino to introduce him into the world of an otaku, and eventually, allowed him to reestablish his role as an older brother to her. in the dino subject series 1, Kirino was having a rough relationship with her big brother Kyosuke, any other hand she hates about dinosaurs. in the dino subject series 2 aftermath, Kirino was very sad to see her deceased Big Brother in a grave, eventually Kirino is starting to get even closer towards Ratchet Fossiler "the main character of the dino subject series". and Kirino is one of the dino formers transformations.