A famous literary character who transforms into an insect is Gregor Samsa from Franz Kafka's novella The Metamorphosis. In the story, Gregor wakes up one morning to find himself transformed into a giant insect (often interpreted as a cockroach or beetle). This transformation profoundly affects his life and relationships, exploring themes of alienation, identity, and humanity. If you'd like, I can provide more details about the story or suggest other characters with similar transformations!