Mopsy is one of Peter's sisters and a major character in the Peter Rabbit franchise
She was voiced by Elizabeth Debicki in the 2018 film adaptation
She is a small, brown rabbit, has brown eyes and wears a yellow shirt. She is also 1ft tall. In the 2012 TV series, she wears a white dress with light blue highlights and red flowers.
in the 2018 film, Mopsy is a smart, feisty, and stubborn rabbit who is a rebel. In the 2012 TV series, Mopsy's a girl big rabbit but she's very kind and sweet to her twin sister, Flopsy and their little sister, Cotton-Tail in the rabbit burrow. Mopsy sings on-key while getting their little sister, Cotton-Tail to sleep in The Tale of the Dash in The Dark. Perhaps due to growing up with a mischievous brother, Mopsy displays a docile responsibility for her age and obeys her mother's wishes without hesitation.
Role in 2018
Like in the novels Mopsy is Peter's sister and the eldest of three triplets with her two younger siblings being Flopsy and Cottontail.
Having recently lost their father the rabbits are looking for revenge against Mr. McGregor and surprisingly succeeded after he dies of a heart attack out of nowhere.
This celebration is cut short however when McGregor's nephew Thomas moves into his uncle's land and manipulates Bea into becoming his girlfriend. Due to this, the animals decide to rage revenge against Thomas.