@Ebalosus
@Dex Stewart
@Sadrai
Hard to say if it was an animation error or an animator having a laugh but being cross eyed
is what made her so popular. Ditzy Doo was a character mentioned in
Winter Wrap-up but wasn’t going to be confirmed as the same character until
The Last Roundup. Her name in the script for that episode was changed to Derpy. Tabitha thought the character was a boy and based the voice on her neighbor’s son, who always sounded sleepy. That’s why the voice was low and the speech slow. Derpy has been used as a slur for neuro-divergent people and combined with the affectation, upset parents. Hasbro then had the name cut and voice work redone to quell any accusations of bigotry. The name Muffins was chosen based on a throw away line the character said in
Applebuck Season. Since the brony fandom was upset by the changes to
The Last Roundup, Hasbro had opted to use an image of a muffin instead of a name on toy packaging for the character.
I think that covers things. With everything that happened, I’m certain that the character is fully retired from the franchise.