Flash Sentry

Flash Sentry is an Equestrian male Pegasus who first appears as one of the main characters of My Little Pony: Equestria Girls. In Equestria, he is one of the guards of the Crystal Empire. In the human world, he is Sunset Shimmer's ex-boyfriend who plays an electric guitar, and bonds romantically with Twilight. Upon returning from the human world, Twilight gets together with the Equestrian version of him, and the two become a couple. After Equestria Girls, he makes 2 cameos in the 4th season of the series.

Equestria Girls
In My Little Pony Equestria Girls, Flash Sentry first appears as a Pegasus pony royal guard in the Crystal Empire. He wears an additional back cloth and saddle plate normally worn by unicorn guards. Twilight Sparkle accidentally bumps into him when entering the throne room. He formally announces her arrival to the other princesses.

Flash Sentry's human counterpart first appears in Canterlot High when Twilight runs into him in the corridor. He helps her up and asks, "Whoa. You okay?" Later, Twilight accidentally spills a beverage on him at the coffee shop, 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 Shimmer 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 asks Twilight out to the Formal, but mistakes her blubbering "no's" as her answer when she was really freaking out over the Formal being postponed. When the Formal reconvenes as originally scheduled, Twilight clears up the confusion with Flash Sentry and agrees to have one dance with him. The Formal is disrupted when Sunset Shimmer rises to power and summons an army of hypnotized students, including Flash Sentry. Twilight and her friends defeat Sunset Shimmer, turning everyone back to normal. Flash Sentry finally asks Twilight for their dance. On the dance floor, he imitates Twilight's odd dancing style, previously seen in Sweet and Elite.

When Twilight returns to the Crystal Castle at the end of the film, she again bumps into Flash Sentry's pony counterpart. He helps her up and states that they need to stop meeting like that. When Twilight's friends say that she must have a crush on him, Twilight denies it, but blushes. Pinkie Pie accurately guesses that he must have reminded Twilight of a rock guitarist whom she met and liked in the human world.

Series
In 'Three's A Crowd', Flash makes a non-speaking cameo as one of Princess Cadance's royal guard escorts, and smiles before getting back on the Crystal Empire train.

Flash reappears in Twilight's Kingdom - Part 1, where he has a speaking role, introducing the Duke and Duchess of Maretonia.

Role in the Series
Flash is first mentioned in Love and Truths before Scroopfan had considered mentioning the Equestria Girls story in the series. He makes his first appearance in The Tallest Talltales EVAH! where he is portrayed in Twilight's story as her boyfriend, just like in reality. Later, he appears as both human and pony in Reverse of Fortune. It is revealed in a flashback that human Flash got back together with Sunset two weeks after a celebration of her reformation. Flash then appears near the end of the episode to share a kiss with Twilight. He made another appearance in Project Nosferatu to have a musical number with Twilight.