*Tanya Mousekewitz is the tritagonist in the An American Tail franchise. She is the cute and lovely big sister of Fievel Mousekewitz.

The oldest Mousekewitz sibling, she loves her little brother a lot. Her singing voice is thought by others, especially Cat R. Waul, to be beautiful.

In An American Tail, she wears a red babushka (European headscarf), a blue blouse with a navy jumper dress and frilly white ankle-length pantalettes. She was also much closer to Fievel's age. She looks much the same as this in The Treasure of Manhattan Island (pictured). In The Mystery of the Night Monster, she looks taller than in the last movie, and her hair is very short. She has stopped wearing her babushka and instead wears a slimmer, professional-looking white blouse, and purple ankle-length skirt.

Tanya plays very little part in the first film. She gets a babushka for Hannukah (a religious holiday) while Fievel gets his hat. She has her doubts about leaving Russia after the cat attack but goes along with her family to the States anyway. She is as hard hit as the rest of her family by Fievel's apparent death but she never loses hope that he survived falling off the ship somehow. She sang the heartwarming but distant duet "Somewhere Out There" with her brother Fievel when they were separated. Whenever Tanya begs her father to look for Fievel, it turns out Fievel is nearby but they don't see each other. She's finally proven right late in the film when the Mousekewitz's meet Tony and Bridget. She's last seen riding on Henri's back with Fievel at the end of the film as they check out the newly-built Statue of Liberty which she said was so beautiful.

Appearance 1st and 3rd films: Slender brown mouse, barefoot, blue top, yellow skirt, frilly white ankle-length pantalettes, orange babushka

Age 8 (1st film)

Occupation Fievel and Yasha's big sister

Likes Her friends and family, her faith, singing, helping others, playing, dreaming, fairness, justice, equality

Dislikes Her friends and family in danger, cats (except Tiger), violence, mistreatment, cruelness, prejudice, judgment, oppression, sexism, racism, oppression, discrimination, unfairness, injustice, no one listening to her, cats attacking, losing Fievel*