Here's a headcanon! Derpy Hooves and Ditzy Doo are twin sisters, along with Dopey Hooves (Earth Pony), Dizzy Doo (Blue-mane), Daffy Hooves (Red-Mane), and Dotty Doo (Purple-mane).
Due to Derpy's love of pranks, Derpy likes to make her siblings dress their manes and tails like her and pretend to be her, which happened during Winter Wrap Up and when Rainbow Dash was setting up Town Hall in AJ's episode, which that time, ended up causing bronies everywhere to freak out.
I might make these two an ask blog.. I leik em.
OH! Also, I made jobs and talents for each one. They all have different cutie marks, although Dopey is quite a painter, and managed to paint on some pretty convincing bubbles on all their butts, so they were all bubblebutts. Huehuehue.
Derpy - Mailmare/Deliverypony
Ditzy - Works for the Ponyville Express newspaper, so she can more easily moniter Derpy, since Derpy often goes to the press to get newspapers to send out.
Dopey - Traveling artist who works mainly in Canterlot.
Dizzy - Weather pony
Daffy - Arcade Attendant ( Works at the Arcade, stocking prizes and maintaining the machines.)
Dotty -┬┬ Waitress at the Cafe in Ponyville.
Base: Found it. beanbases.deviantart.com/art/F…