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 cold 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 the biological father of Nadia and rightful ruler of Atlantis, a the latter being a position he rejected in favour 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.

:Template:Voiced by Akio Ohtsuka (Japanese), Jeff Winkless (English, Streamline), Ev Lunning Jr. (English, ADV) ;

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