Shining Armor is Twilight Sparkle's older brother, the father of Princess Flurry Heart, and also the eldest son of Mr. Sparkle and Mrs. Sparkle. Shining Armor is the captain of the Royal Guard and the husband of Princess Cadance. He has a similar body design as Fancy Pants (Trevor Devall). In the spin-off television series Two and a Half Ponies, he is one of the six main protagonists alongside Fancy Pants, Soarin (Matt Hill), Mr. Cake (Brian Drummond), Big Macintosh (Peter New), and Thunder Lane.
Shining Armor is described as being very close to Twilight, sharing everything with her. According to Twilight, the two had never had any fights, showing that the two shared a close bond. Twilight calls him her "B.B.B.F.F" (Big Brother Best Friend Forever).
Shining Armor is implied to be a powerful magic user. He is able to conjure and maintain a force field around Canterlot, and was the only unicorn on the guard able to do so at the time of A Canterlot Wedding, Part 1, she apologized to Twilight near the end of Canterlot Saga.
In A Canterlot Wedding, Part 1 and Part 2, Shining Armor is shown to be capable of maintaining a forcefield enveloping all of Canterlot that is capable of keeping out an army of Changelings. However, this put quite a bit of strain on him and caused terrible headaches.