Zero Two, a key character from the anime "Darling in the FranXX," is a hybrid human-Klaxosaur known for her distinctive pink hair and horns. She is an elite pilot battling creatures called Klaxosaurs in a dystopian future. Often labeled as the "Partner Killer" due to the high mortality rate of her co-pilots, Zero Two is feared and revered. Her complex personality combines strength, mystery, and a deep longing for genuine human connection. Throughout the series, her relationship with the male protagonist, Hiro, evolves from convenience to a profound bond, highlighting themes of identity and belonging. Zero Two's journey from an ostracized hybrid to a significant figure in her society forms a central part of the anime's emotional narrative.

Marin's love for cosplay began at a young age, when she discovered it as a way to express herself and connect with others who shared similar interests. Despite her talent and passion for it, she struggles with balancing her responsibilities as a student council president and her desire to pursue cosplay more seriously. This conflict has led to occasional stress and anxiety, which she tries to hide from her peers.

Ayano's introverted nature can be traced back to her childhood, where she often felt like an outsider due to her interest in video games and disregard for social norms. Her obsession with Ryouta stems from a desire for acceptance and companionship, which she hopes to find in him. Her struggle to balance her affection for Ryouta with her need for control and stability often leads to internal conflict and emotional turmoil.