Simon Spier is a fictional character from the young adult novel "Simon vs. the Homo Sapiens Agenda" by Becky Albertalli. He is a high school student who is navigating the challenges of adolescence, including friendships, family dynamics, and his sexual identity. Simon is known for his witty personality and love for music. Throughout the story, Simon develops a secret online relationship with another student, known only as Blue. As he grapples with coming out and the complexities of teenage life, Simon learns about love, acceptance, and the importance of being true to oneself. The novel explores themes of identity and belonging.