He was, initially, a perfect duplicate of Seto Kaiba, created by Seto to reside and look after the Kaiba Corp station. Along with the other artificial intelligences.
He is self sufficient and self aware. Yet this doesn’t stop him from ruminating on his state as a creation. With this, he gained an artificial consciousness of his own. And, the station that he once protected became a prison for him. A consistent reminder of his own inhumanity-- that he’s false.
Despite this, he has no resentment towards Kaiba. He gradually became less of an assistant and more of a friend to Kaiba. His purpose shifted from tending to the station, to caring for Seto.
He gives up his form in order to leave his bird cage with Kaiba, and resides within the recesses of his augmented mind. And is able to essentially possess Kaiba when he sleeps. Wearing his flesh as he roams the mansion at night.
Can manifest through the Dual Dimension System, and prefers to take the form of the Deep Eyes White Dragon and The Blue Eyes White Dragon. Either that, or he mirrors Kaiba’s form.
Through observation and study, he’s developed his own personality, separate from Seto’s. Ironically enough, Ai is far more empathetic than Kaiba is himself.
Is the embodiment of unconditional love and loyalty.
Verse between @sethokai and I!