Rei Kiseijou
キセイジョウ・レイ
Rei is the leader of the Seven Sages. But this title seems to be meaningless, as she is teased on a near daily basis by the other six members of the Sages and sent to do pitiful work.
In her HDD form, Rei is certifiably insane, incredibly arrogant, and downright rude. After the fall of her nation, Tari, she developed the belief that because she failed as a CPU, all CPUs will fail. The traits of her HDD form can sometimes leak into her human form. At the end of the game, she is able to actively derive confidence from her HDD personality without becoming insane. She used to be the nation Tari’s CPU.