Flash Sentry is a male supporting character who appears in My Little Pony Equestria Girls and a minor character in My Little Pony: Friendship is Magic.
He is voiced by Vincent Tong.
Role in the film
Flash Sentry's pegasus pony counterpart appears first, in the film in the Crystal Empire throne room. His human counterpart appears later, helping Twilight Sparkle up after she stumbles in the hallways of Canterlot High. He appears again at the local coffee shop, where Twilight accidentally spills her drink on him and he jokes they need to stop bumping into each other. Rarity reveals to Twilight that he is Sunset Shimmer's ex-boyfriend.
When Sunset frames Twilight for ruining the Fall Formal decorations, Flash Sentry proves that the pictures are fake and Vice Principal Luna allows Twilight Sparkle to stay in the competition. Twilight is so thrilled that she hugs Flash Sentry. He then asks Twilight on a date to the Formal but mistakes all of her blubbering "no's" as her answer when she was really freaking out over the Formal being postponed. When the Formal does reconvene as originally scheduled, Twilight Sparkle clears up the confusion with Flash Sentry and agrees to share one dance with him. He is later one of the many students put under Sunset Shimmer's control when she rises to power. After Twilight and her friends defeat Sunset Shimmer and everyone is turned back to normal, Flash Sentry finally asks her for their dance and he imitates Twilight's odd and atrocious dancing style, previously seen in Sweet and Elite.
When Twilight Sparkle returns to Equestria at the end of the film, she again bumps into Flash Sentry's pony counterpart. When Twilight's friends say that she must have a crush on him, Twilight Sparkle denies it, but blushes. Although, despite that, Pinkie Pie manages to accurately guess that the guard Flash Sentry reminds Twilight Sparkle of a rock guitarist she met and liked in the other world.
In Equestria Girls: Legend of Everfree, Flash gets over his desire to develop a relationship with Princess Twilight again and becomes friends with Sunset Shimmer.
IDW Comic Books
My Little Pony: Equestria Girls Holiday Special, Flash Sentry is shown in a MyStable picture on page 15 and mentioned in Anon-a-Miss' MyStable post "I saw Flash Sentry at the..." on page 30; he is "at his grandma's for the holidays" according to artist Tony Fleecs.
In My Little Pony: Friendship is Magic, Flash Sentry's pony counterpart made a few brief appearances as one of Princess Cadance's guards.
Flash Sentry was shown to be kind, gentle, benevolent, and a true gentleman. He returns Twilight's feelings of affection towards him as a human. He plays the guitar and is in a band, which performs at the Fall Formal and is specified in the screenplay novelization Equestria Girls: Through the Mirror to be named Flash Drive.