Here is Twilight Velvet for my headcanon!
Bio:
Species: Unicorn (1st Form), Bee Pony (2nd Form)
Gender: Female
Friends: Pear Butter, Cookie Crumbles, Windy Whistles, Cloudy Quartz, Posey Shy, Mrs. Paleo, Rarity, Sweetie Belle, Applejack, Apple Bloom, Big Macintosh, Rainbow Dash, Scootaloo, Fluttershy, Pinkie Pie, Marble Pie, Maud Pie, Limestone Pie, Discord, Moon Dancer, etc.
Family: Night Light (Husband), Shining Armor (Son), Cadance (Daughter-in-law), Blueblood (Son-in-law), Skyla (Granddaughter), Flurry Heart (Granddaughter), Spike (Adoptive son), Rarity (Adoptive daughter-in-law), Sweetie Belle (Adoptive daughter-in-law), Twilight Sparkle (Daughter), Queen Chrysalis (Daughter-in-law), Nyx (Adopted granddaughter), Twila (Adopted granddaughter), Larva (Step-granddaughter), Crystal (Step-granddaughter), Silverlay (Adopted daughter), Applejack (Child-in-law) and Discord (Son-in-law)
Note: The events of Season 8-9 (With the exception of The Washouts, Sound of Silence and Best Gift Ever) are not canon.
Note II: Applejack is Non-Binary in my headcanon and uses He/She and They/Them pronouns.
Note III: Applejack ends marrying both Discord and Silverlay after losing a bet!
Note V: Velvet became a Bee Pony after a misunderstanding. You see, some bee ponies were in of somepony to help them. Velvet took pity on them after seeing how sad they were, so she signed up. When she signed, she thought that she would be a delivery pony dropping honey jars and pots to doors, however as it turn out she was to become a bee pony to
make honey! Velvet was shocked after seeing her new form, but then she realized the great advantage of being a bee pony (Such as making good honey and talking to bees) and, with the help of Celestia, she can now has a special spell that allows her to transform into her bee pony form and change back into a unicorn again. This based on this:
https://derpibooru.org/images/3398084