Nancy is an anthropomorphic white mouse. She wears purple eye shadow, a blueish-purple sequin dress covered by a short-cut, metallic light-blue jacket and light-blue metallic boots with purple flat heels. She also carries a purse with her on visits to the nightclub.
Nancy was mostly silent throughout her appearances in Sing, and mainly appeared as an accessory of sorts. She appears to be materialistic, not willing to pay attention to Mike until she saw him pull up to the nightclub in a shiny red convertible. She occasionally phones him sometimes, saying she misses him. However, she becomes genuinely loyal to Mike, as she also saves his life towards the end of the film when she found out the bears were out to get him.
They're apparently close enough that Mike trusts her with the key to his car, which enabled her to save him.
Nancy and Mike first met outside of a nightclub, not long after the events of the audition sequence. Mike discovered her walking towards the entrance and began playing his saxophone near her. She was generally impressed, but didn't say anything to him. Nancy entered the nightclub and Mike was denied entry from a bouncer. Just before going in, she turned back and smiled at Mike before continuing her route. In a later scene, Mike returned to the nightclub in a red convertible car, which further earned Nancy's affection. The two then entered the nightclub with hands joined.
A while later, Nancy was present with Mike as he cheated a trio of bears in a card game, but was then separated after Mike was caught and then pursued by them. She wasn't seen again until Mike's performance of "My Way", which she saw being telecast in the nightclub.
The bears discovered Mike on TV and began heading to Moon Theater, which alerted Nancy to go save him. During Meena's performance of "Don't You Worry 'bout a Thing", Mike was grabbed by the three bears and taken outside. She pulled up in Mike's red convertible, moments after Mike was swallowed by the bear leader. She slammed the door into the bear's stomach, causing him to spit Mike out. He quickly got into the vehicle and Nancy drove him away from the chase while speaking her only lines in the movie. It is unknown what happened to her or Mike after these events, as they were not present during Moon Theater's grand re-opening, which was the final scene of the movie.
— Nancy agreeing with Mike that their escape from the bears was a close call
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