Noah had three disciples: Xande, Doga and Unei. He trained and gave each of them a gift: mortality to Xande, vast knowledge of magic to Doga, and absolute control of the dream world to Unei. His fate after this is unknown, but an Evoker in Replito mentions his demise offhand.
Noah was responsible for the sealing of Leviathan and Bahamut on the Floating Continent, it is also stated that he was able to summon them both. He could not only use both white and black magic, but he could also use summoning magic.
The Magus is referenced several times through items and abilities: Noah's Lute is an item used in the game to awaken Unei from her sleep, and the song used by Bards in the game is called "Lute of Noah".
Much of the game is centered around floods of some variety, such as the Flood of Light, the Flood of Darkness, or the flood that resulted from the lack of functionality of the Water Crystal.