*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: Fievel Goes West, she was much older likely in her early teens and her age range from Fievel was increased. This was her oldest incarnation, as in later sequels she is aged down again. She dropped her red babushka for a long ponytail and an orange and brown dress. She had big aspirations to become a singer and had a beautiful singing voice, which didn't fit in well with her New York neighbors (as Mama Mousekewitz prepared some of the food they throw as the family dinner).

Tanya is given a much larger role in the sequel and is much older. At the beginning of the film, it is shown that Tanya wants to be a famous singer, but her talents go unappreciated. After moving to Green River, Cat R. Waul finds her singing the song "Dreams to Dream" in the streets and is instantly entranced by her voice before even seeing her. He then takes Tanya under his wing, entitling her as "The Diva" and having her perform at a saloon for his gang, with Miss Kitty to be her mentor. She instantly wins over the cats with her song "The Girl You Left Behind". After the praise she has received by her "public", Tanya becomes somewhat delusional from her fame. Seeing Waul try to put the mice of Green River into a giant mouse trap during the film's climax snaps her out of it, though, and by the end of the film, she realizes she can still be beautiful by being herself, washing her makeup off. And also taking off her orange high heels.

2nd film: very slender brown mouse, brown top with yellow sleeves, orange ankle-length skirt

Age 15-16 (2nd film, Fievel's American Tails)

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

Weapons The secret weapon, her singing voice*