Lagos

Lagos was a citizen of Patema's world. Aside from modeling his appearance after Spike Spiegel, Lagos spent most of his time acting like an older brother figure to Patema. Patema respected and looked up to Lagos more than The Elder. However, Lagos felt constrained by life underground and wanted to go explore the other world. This was prohibited by The Elder, but he did it several times anyway. Before every journey, Patema would beg Lagos not to leave. Upon his return, he would always bring Patema gifts. They were usually just little trinkets, but he also brought her a photograph of the other world at the beginning of the film.

Lagos's actions and descriptions of the other world had a profound impact on Patema. It directly inspired her exploratory nature. On Patema's first night in Aiga, Age is sitting outside looking at the stars. She joins him and comments on how beautiful the sky is. The reason she thinks this is because the image mirrors the photograph that Lagos gave her.

On his travels, Lagos met Age's father before his death. The two shared the same enthusiasm for projecting humanity into the sky and became immediate friends. They began to study the gravitational pull and conduct scientific experiments. Lagos then aided Age's father in building the flying machine. Lagos returned to the underground world after his friend's death.