Linmei, a supporting character, shares an orphanage background with protagonist Natsume. She consistently appears with an entourage and maintains persistent antagonism toward Natsume, frequently initiating conflicts and mocking her ambitions. Examples include deriding Natsume's failure to join The Power combat unit and engaging in petty harassment like placing insects in her food.

Physically, Linmei has distinctive purple hair and green eyes. Her typical attire features a dull cyan-green single-sleeved top, lime-green pants, and light brown shoes.

After leaving the orphanage, Linmei works as a demolition worker. Her career trajectory shows no evolution, with unchanged professional roles and static personal motivations throughout the series. Linmei undergoes no substantial character development or narrative evolution, appearing only sporadically to reinforce her role as a secondary antagonist within Natsume's social circle. She does not appear in expanded media such as movies, OVAs, or spin-offs.