Princess Celestia (voiced by Nicole Oliver) is a beautiful white alicorn and ruler of Equestria. She's also the older sister of Princess Luna and mentor to Twilight Sparkle. Her goal, other than ruling her kingdom, is controlling the sun and raising it in the morning, and setting it at night. Her sister controls the moon at night. Although considered a wise ruler, she's also fun loving and impish, but never does anything that can harm her subjects.
Celestia is seen as a highly respected princess by the FT Squad. Also, Celestia serves as a Future Time Travel Authority, serving the organization from Equestria.
- Celestia met the FT Squad in The FT Squad's Adventures in My Little Pony: Friendship is Magic. It was revealed that she invited the team, and guest stars to Ponyville, because she sensed that they had some connection with the Elements of Harmony. It was also revealed that she revived Bruton, who the squad first met in The FT Squad's Adventures in Dinosaur. Since then, she's made recurring appearances in the series.
- Celestia made minor guest appearances in The FT Squad Meets Mulan, The FT Squad's Adventures in The Lion King 2: Simba's Pride, and The FT Squad Meets the Hunchback of Notre Dame.
- Celestia will make occassional appearances in The FT Squad's Adventures With Phineas and Ferb. In an original DeviantArt story, she'll meet the shy and timid Kyle Larman, where she'll encourage him to just be himself around others, including her. Kyle will in turn start idolizing her as a wise, beautiful and compassionate hero. Kyle will refer to Celestia as his favorite Future Time Travel Authority. Celestia won't mind this nice worshipping and will provide useful advice and companionship to the boy at times. She will also allow Kyle send her letters whenever he wants to talk with her. Celestia will appear mostly in season 2 of the series.
- Celestia will officially guest star in The FT Squad's Adventures With Phineas and Ferb: Summer Belongs to You, though she won't appear as many times as the other guest stars. Instead, she'll be staying behind and looking for a way to help Kyle feel better from his anxiety problem.
- Celestia will make minor appearances in the B-story of The FT Squad Goes to Monsters Inc. and The FT Squad Goes to Jurassic Park.
- Celestia will guest star in The FT Squad's Adventures in Rock-a-Doodle.
- While Twilight Sparkle is Celestia's faithful student, Celestia sees Kyle the Otter as another faithful student and shows immense faith in him.
- Celestia is truly the leader of the Elite Guard Equestria Council, like her younger sister Luna they bring balace honor to Equestria Elite Guard Days.
- Princess Celestia also sees Thomas as a faithful student since he and Percy helped Twilight Sparkle save Canterlot from Queen Chrysalis in Thomas' Adventures of My Little Pony Friendship is Magic - A Canterlot Wedding (Full Movie).
- Princess Celestia is also Duck's Girlfriend.
- Princess Celestia is also best friends with Sir Topham Hatt.