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This article may contain spoilers.
Nemo is the captain of the Nautilus, a submarine manned by individuals looking to stop the Neo-Atlanteans at all costs. He is a mysterious man with a dark past who acts coldly when he first meets Jean and Nadia but later warms up to Jean's outgoing cheerfulness and enthusiasm. He becomes a father-figure and mentor to both Jean and (most especially) Nadia.
It is eventually revealed that he is Eleusis La Arwall (エルシス・ラ・アルウォール Erushisu Ra Aruwōru), the biological father of Nadia and the rightful ruler of Atlantis, the latter being a position he rejected in favor of peacefully roaming the oceans and living amongst the humans. He also has a secret relationship with Electra, who he impregnated and eventually gives birth to Nadia's half-sibling.
While he acts cold and aloof when he first meets Jean, he nonetheless warms up to his outgoing cheerfulness and enthusiasm. Nadia, meanwhile, is very distrustful of him and is quick to accuse him of murder when he shoots a Neo-Atlantean to save her from death. However, she eventually learns to respect Nemo, and, in the end, at last, acknowledges him as her father. Nemo then dies after overloading the Neo Nautilis's reactors to blow a passage out of Red Noah, permitting the rest of the cast to return to Earth.
- Nemo's name is a reminiscence of the Greek city Eleusis, the place in Greece where the followers of Demeter met annually to initiate members into the ways of the Earth-goddess, and Ra, the sun-god of Heliopolis in ancient Egypt.
- He is based on Captain Nemo (literally meaning "no man" in Latin).
- He also bears a striking resemblance to another famous anime captain, Bruno J. Global/Henry J. Gloval of the SDF-1 Macross in Macross/Robotech.
- Additionally, he wears a uniform similar to Captain Junzo Okita from Space Battleship Yamato/Star Blazers.