 At the conclusion of the first season , one of the show 's animators confirmed that " Derpy " would be a scripted background character in the second season , and was a part of several sight gags . In the original broadcast of the mid @-@ season episode " The Last Roundup " as well as on the home media The Friendship Express release , " Derpy " was called out by name by Rainbow Dash , and given lines ( as voiced by St. Germain ) and klutzy mannerisms as a direct call @-@ out to the brony fandom . Though most of the fans appreciated the inclusion , some viewers had a negative response to the character , believing it insulted the mentally handicapped . Hasbro subsequently modified these scenes , and while " Derpy " is still present in subsequent broadcast and digital versions of the episode , she is not named , and a different voice is used . According to Hasbro 's Nicole Agnello , " Some viewers felt that aspects of the episode ' The Last Roundup ' did not stay true to the core message of friendship which is the heart and soul of the series . Hasbro Studios decided to make slight audio alterations to this single episode . " Despite Hasbro 's intentions , some members of the brony community were disappointed , and some made efforts to restore the original voice . " Derpy " remained in background cameos throughout other episodes in season 2 and 3 . Within season 4 , Derpy was re @-@ introduced , remaining silent and unnamed but with her original wall @-@ eyed look , as a side character in the main story of " Rainbow Falls " . The appearance was planned as a big reveal for the brony fans , according to co @-@ director Jim Miller , and that " she is here to stay " according to Hasbro 's vice president for entertainment Mike Vogel . The Derpy character is used often on Hasbro 's marketing of the show . For example , Hasbro 's exclusive pony toy at the Comic @-@ Con International and My Little Pony Fair in 2012 was based on " Derpy " , and has the same cross @-@ eye look . 
