5. Mirror Una Chin‑Riley (Number One)
Rebecca Romijn's Una is already a study in controlled duality: a compassionate first officer who’s also an Illyrian augment hiding a genetic secret that could end her career. In a Mirror story, that same heritage becomes a weapon instead of a liability, turning her into the model Terran officer who has nothing to hide because power is the only law.
A Mirror Una would likely be the consummate imperial XO: ruthlessly efficient, openly proud of her engineered advantages, and willing to push subordinates past their limits in the name of “perfection.”
Watching her weaponize the loyalty Pike and La’an feel for her in the Prime universe would add sting to every scene, especially if Mirror Una treats La’an as a prized asset rather than a found family member.