Marie is a 4-year-old orphan found by Nadia and Jean whose parents were murdered by the Neo-Atlanteans. The two decide to stay with her and protect her. She is incredibly intelligent and charismatic for her age. Her playmate is "King" the Lion cub.  (Source: Wikipedia)

In 1889, the world is on the pinnacle of great discoveries in technology. In mankind's grasp for the future, a sinister foe known only as Gargoyle, obsessed with restoring the former Atlantean empire to the glory it once held, begins his plans to take over the world. Nadia, with the help of a young inventor, Jean Raltique, and the mysterious captain Nemo of the submarine Nautilus, must fight to save the world from Gargoyle and Neo-Atlantis. Based on the Novel '20,000 Leagues Under the Sea' by Jules Verne. 
(Source: Anime News Network)

[Wiki (jp)](https://ja.wikipedia.org/wiki/水谷優子)

Wife of [Mizuho Nishikubo](https://anilist.co/staff/102460/).

Passed away due to breast cancer on May 17, 2016.

Born as Nicola Betina Grupe, but changed her name in September 2011 with her marriage.

Daughter of [Philippe Ogouz](https://anilist.co/staff/142782) and [Agnes Gribe](https://anilist.co/staff/96614)

Sister to [Emmanuelle](https://anilist.co/staff/158649)

Three years after the defeat of Gargoyle and Neo-Atlantis, a new threat has surfaced bent on bringing the world under his control. Geiger, using advanced robot technology, is attempting to begin a world war, and take control of the devistated world after the destruction has stopped. Once again, Nadia and Jean must fight to save the world, only this time from itself.
 
(Source: Anime News Network)

Cousin of [Cinzia Massironi](https://anilist.co/staff/104985)

A shorter, more streamlined version of Nadia called "The Nautilus Story", which all but eliminates the filler arc and concentrates on the struggle between Nemo and Gargoyle. Some scenes in the more pivotal episodes are cut as well. The compilation series was made by Hideaki Anno, who was said to have been dissatisfied with the final result of the TV show. The Nautilus Story was only released in Japan on VHS and laserdisc.
 
(Source: TV Tropes, edited)

Marie en Carlsberg