This is Rainbow Blitz one of Rainbow Dash and Soarin’s 4 kids.

Credit for the based used to make Blitz goes to xBubbles-Bases.

Bio:

Rainbow Blitz is the 2nd oldest child of 4 children of Rainbow Dash and Soarin with the oldest being his older sister Aurora Light. He is part of the Neo Main 6 alongside Quazelight Sparkle, Applecrush, Cheesecake, Radiant Spark, and Flutter Wing. He may takes after his dad more than the rest of his young brother and two sisters, but personality wise he takes after his mom very much. Loyal to his friends and family to bitter end and is just as fast his mom even able to do a Sonic Rainboom like his mom.

Blitz dreams of becoming a Equestrian Air Force fighter pilot like his parents and become a Wonderbolt with the hood that one day he could become a full fledged Astronaut pilot for Equestria’s new space program and become an explorer discovering and exploring uncharted planets in the galaxy and hoping to battle the forces of evil in the end. Even though he may be fast Blitz has never found an equal to match his speed in the air.

That is until one day a strange new pegasus stallion arrives from another world and is near Blitz’s age. The stallion happened to be Sonic the Hedgehog who got sent to Terra thanks to Doctor Eggman’s latest failed scheme of world domination in using the powerful Chaos Emeralds to power a new machine. At first Blitz didn’t trust Sonic as Sonic’s first time in Ponyville was a bit rocky to say, but when the city was attacked and citizens being captured Sonic sprang into action as usual demonstrating his speed and skill in battle saving the day and putting the unknown robot to the scrap heap. The town hailed Sonic as a hero and Blitz impressed and amazed at Sonic’s speed and selflessness in risking his own life to save many civilians from a unknown foe calls him not only as a friend, but also a rival which Sonic agrees pretty well with as Blitz can give him a challenge to see who’s the fastest on the land or in the sky.