Mari Koyama is a supporting character in 16bit Sensation: Another Layer. She is a high school student who works as a scriptwriter under the pen name Lalako. She joins the game development studio Alcohol Soft alongside her twin sister Chisato, and together they are known as the duo KikiLala. Their arrival brings fresh creative talent to the studio's bishoujo game projects. Mari's primary motivation is to contribute her writing skills to game development, reflecting a passion for storytelling and the bishoujo game genre. Her role in the story involves collaborating with other members of Alcohol Soft, providing scripts that help shape the games they produce. Her key relationship is with her twin sister Chisato, with whom she works closely as a creative partner. Over the course of the series, Mari develops as a writer, gaining experience and becoming more integral to the studio's output. Her notable abilities include writing compelling narratives suited for bishoujo games and working effectively as part of a creative duo. Her personality is marked by imagination, enthusiasm, and a collaborative spirit, allowing her to adapt quickly to the demands of game development despite her young age.