We now have Alternate-Universe (Read Infinity server) Mirror Siblings. Slight difference in the dynamic, hinging on one moment in their first youma battle:

We have MirrorKnight Naoko, and MirrorSaint Hiroko.

Hiroko is effectively Mirrorguardian Naoko from Virtue, and Knight!Naoko is MirrorKnight Hiroshi still in her original body. It's complicated, but when is the Mirrorverse not?