Noa

From Galaxy Angel Wiki, the comprehensive Project G.A. reference.

Noah
Noah in TCY 412 with Black Moon's core
Gender:	Female
Age:	10 (TCY 412) 14 (TCY 417)

Noa is the administrative control system of the Black Moon, and for much of the first game she assists Eonia in his attempt to conquer the Transbaal Empire. She refers to Eonia as "onii-sama," one of many Japanese terms for an older brother. It is later discovered that Noa is the one manipulating Eonia from behind-the-scenes. However, in the second and third games of the trilogy, it is discovered that it was her automatic interface that was responsible for the events of the first game, and that the Black Moon and White Moon were both created to be defensive satellites for EDEN. As such, she becomes an ally in these games in the subsequent war against the true enemy of EDEN, Valfask. She is voiced by Asuka Tanii (谷井あすか).

The English manga refers to her as "Noa".