Cardinal

Cardinal is supporting character of Sword Art Online: Alicization.

She is voiced by Sakura Tange who is famous for voicing as Sakura Kinomoto in Japanese version and Lizzie Freeman in English version.

History
Where a warp gate appears in front of them, taking them to a grand library. The woman who teleported them turns out to be the Cardinal System of that world, and knows that Kirito is from the real world. She then goes on to explain the history of the VR world, how it all started and who developed and created the Taboo Index.

When flashback of the Administrator is losing her own memory space, and so gets a child to link their memory. But this was a fatal mistake of the Administrator, because this means the child gets the same authority and power. This comes to the attention of the child (which is now to be revealed as the cardinal of the great library) and so, she attacks the Administrator. She flees to the one out of two places the Administrator doesn't have authority over, the great library. She spends the last 200 years thinking of a way to defeat the Administrator and finds Kirito and Eugeo in the process. She also explains how to get the Integrity Knight's memory back. Thus, the Cardinal allies with Kirito and Eugeo to defeat the administrator and get back Alice.

Cardinal entrusted to them, despite Cardinal's instruction to save the weapons for Alice and the Administrator.

Cardinal appears and incapacitates the Golem with a lightning strike, heals Kirito and Alice, and mourns Charlotte's death.

Cardinal proposes to make a deal with Administrator: Cardinal's life for the freedom of Kirito, Alice, and Eugeo. Administrator accepts and begins to relentlessly strike Cardinal with lightning. Shortly before her death, Cardinal grants Eugeo his wish to be fused into his sword.