ALICE

ALICE was an experimental Artificial Intelligence installed on the MSA-0011 S Gundam.

ALICE was an AI designed to replace a human pilot, however she was designed to learn through experience in a similar, albeit more complete and accelerated manner than that of a human. In order to facilitate this and evoke the most dramatic results she was programmed to respond in a human way to that pilot much as if they were the only other being that existed in the universe and absolutely the only one that she would have direct contact with. For this reason, and to implement a stronger system it was decided that she would have a female personality and be equipped with a male pilot. He would fulfill all the roles in life that she would need, initially as a father, then as she grew older he would act as a trusted friend, and ultimately as a lover.

ALICE was cruelly forsaken to eternal loneliness in this manner as it was decided that love is transitory if left to blossom and that if there were a mutual affection between her and her pilot it would end as one or the other (most likely him) had these feelings pass and moved on. In order to facilitate the maximum performance possible it was decided that ALICE's love must be unrequited and so it was decided that her existence be kept secret, especially to her pilot.

(Source: Gundam Wiki)