Charlie Smith is a pivotal supporting character in the anime series 'Hikari to Yoru no Koi.' As an exchange student from abroad, Charlie brings a unique perspective to the main cast and often acts as a mediator during conflicts. His friendly demeanor and genuine curiosity about Japanese culture help bridge gaps between the protagonists. Throughout the story, Charlie provides emotional support and comic relief, making him a beloved character who significantly impacts the growth and relationships of the main characters.