Soarindash offspring

From left to right we have:

Lockheed. The eldest. As a kid he was always told that he's responsible for watching over his siblings, so becoming a royal guard when he grew up seemed like the next logical step. He's rather sweet-natured and the most like his father. A good flier like all of Rainbow Dash and Soarin's children, but built more for endurance than speed. Lavender is somewhere around the Cmc's age when he's born.

Mercury. Second eldest. As an adult she's a top researcher and scientist in the Cloudsdale weather factories. She has a rather sarcastic streak, sometimes becoming downright venomous, which has earned her the teasing nickname of Quicksilver by her brothers. Often in disagreement with Rainbow Dash, who she sometimes regards as a bit of a meathead.

Snowburst. The youngest and most like his mother. Quick, arrogant and a bit of a womanizer. Almost as fast as Rainbow Dash in her youth, but more agile. To him it was never a question of what he wanted to be when he grew up and naturally he did join the Wonderbolts, though he had to fight off accusations that his mother and father pulled strings to get him in. Later on he was offered the position of captain but refused on the grounds that he'd rather fly than deal with recruits and other such responsibilities. The butt of many "20% cooler" jokes at the hands of his siblings.

Despite their differences they are tremendously loyal to each other.