Rei
The AI aboard the SPT-LZ-00X Layzner, its intelligence was so advanced that it developed an actual personality of its own which was nicknamed "Rei" by Eiji. Despite having feminine characteristics and the nature of a sweet child, Rei had no notion of morality and would usually recommend destroying the cockpit of an enemy SPT-instantly killing its pilot-rather than disabling its limbs as she believes that this is the most effective way to defeat an enemy. Often, she would seize controls of the Layzner herself in order to protect Eiji and the SPT from damage.