Lin is a Designer Child who serves as the host for the Planetary Gear known as Liban in the anime Captain Earth. She is introduced as the sixth member of the Planetary Gears to awaken, and she possesses a physical appearance that is slightly taller than the protagonist Daichi Manatsu, with slightly tanned skin and short celestine-colored hair. Her personality is defined by a fierce competitiveness and unshakable self-confidence. She openly declares herself the best biker and backs this claim with genuine skill, exhibiting a fanatic love for speed and the sensation of wind rushing past her. Her motivations are tied to her nature as a Designer Child, an artificial being created to house a Planetary Gear, and she appears to take great pleasure in high-velocity activities. In the story, Lin functions as one of the alien Kill-T-Gang (Planetary Gears) that threaten humanity, operating through her artificial body and piloting her true form via a Machine Goodfellow when necessary. Her relationships with other characters are not extensively detailed in the available information, but as a member of the Planetary Gears, she interacts with other Designer Children and their respective hosts. Her development within the narrative follows her reawakening as part of the group. Notable abilities include her skill in high-speed biking and the powers inherent to her Planetary Gear identity, including access to a singularity ability and the capacity to pilot her Machine Goodfellow in combat.