OVA
Description
Mimmy is the identical twin sister of Hello Kitty (Kitty White), introduced shortly after Hello Kitty's debut in 1974. She shares nearly identical physical features with her sister, being a white anthropomorphic cat, but is distinguished by a yellow bow on her right ear instead of Hello Kitty's red left ear bow. Mimmy typically wears orange or yellow overalls with a yellow shirt, though her clothing varies across different media; early depictions sometimes featured green overalls. Like Hello Kitty, Mimmy is generally portrayed without a visible mouth, though some animated series depict her with one.

Mimmy's personality is characterized as shy, polite, thoughtful, and more reserved compared to Hello Kitty. She is described as girly, with hobbies centered on sewing, patchwork, and dreaming about marriage. Her favorite school subject is home economics, reflecting her domestic interests. Despite their closeness, Mimmy and Hello Kitty occasionally experience conflicts, such as disagreements over baking mishaps or interpersonal situations. In "The Wonderful Sisters" episode, Mimmy's baking skills surpass Hello Kitty's, leading to tension when Hello Kitty interferes in Mimmy's attempts to befriend Robert, highlighting Mimmy's proficiency in baking.

Mimmy lives in London with her family, including her parents (George and Mary White), grandparents, and Hello Kitty. She is not only Hello Kitty's sister but also her best friend and constant companion, with their relationship emphasizing mutual support. In various OVAs, Mimmy plays supportive roles: In "Hello Kitty no Yume Dorobō" (The Dream Thief), Mimmy and Hello Kitty suffer sleep deprivation due to a dream-stealing creature, and Mimmy receives a non-romantic kiss from Fifi as gratitude. "The Wonderful Sisters" showcases Mimmy navigating her shyness while befriending Robert. She also appears in other OVAs like "Hello Kitty no Minna no Mori wo Mamore!" (Save Everyone's Forest!), "Kitty to Mimmy no Happy Birthday", and "Hello Kitty no Alps no Shoujo Heidi".

Mimmy occasionally features in video games, typically as a secondary character or player-two option, such as in "Hello Kitty Island Adventure" and "My Hello Kitty Cafe" on Roblox. Within the broader Sanrio universe, Mimmy is recognized as one of Hello Kitty's closest friends, alongside My Melody. Her popularity is reflected in Sanrio's annual character rankings, where she has consistently placed between 19th and 33rd from 2020 to 2025.

Her full name is Mimmy White, and her name is pronounced "mi-mi-y" in Japanese, with variations like "Mimi" used in Korean and Mandarin localizations.