Princess Celestia

Princess Celestia, called Queen Celestia in one comic and early development, is an Alicorn pony, the former co-ruler of Equestria alongside her younger sister Princess Luna, and the adoptive aunt of Princess Cadance. In addition to her responsibility of raising the sun, she has also been the teacher of Twilight Sparkle and Sunset Shimmer at different periods in time, often addressing Twilight as "my faithful student" while mentoring her. She has a pet phoenix named Philomena.

In When the Cold Breeze Blows Away, she still rule and lead Equestria since Equestria joined the Grand Alliance in during World War III.

Therefore,she had choice to control her royal armies to protect Equestria,Canterlot and all of ponies from new enemies. Or she will help the Grand Alliance.

Until the USRAC War, she must defend Equestria from communist pony forces and Beleninsk Pact. But later caused New Central Powers starting attack on Canterlot and eventually capture her.

However,Twilight Sparkle will try rescue her by leading Equestria and the her ponies with the help of Mane Six before The Journey Home song made her released.