- —Nancy Whitehead[src]
During an attempted armed robbery at the campus' bank, which was thwarted by Squirrel Girl, Nancy deduced her roommate's secret identity due to the fact that one of the rodents she was using was Tippy-Toe, Doreen's pet. Later that day, Nancy confronted Doreen regarding her heroic alter-ego, and became her confidante. Since then, she has helped Doreen in several adventures.
Nancy attempted to talk sense into Mole Man, after he continued harassing Doreen for a date, until he threatened to prevent her from returning to the surface world. Since he did not listen to her she let Tippy-Toe and many other squirrels loose on him. 
When a grifter fake Silver Surfer threatened the planet of Chitt-crrt with the arrival of Galactus, its inhabitants, the squirrel-like Chrrt-chuk, adbucted Tippy-Toe, believing her to be responsible for Squirrel Girl's deterring of Galactus on Earth. They accidentally took Nancy with her. Nancy and Tippy were reunited with Doreen, who came looking for them, and together they deduced the scammer's ploy. When the grifters returned, Nancy attempted to use the Chrrt-chuk's advanced holographic technology to scare them off with an image of Galactus, but the emitters were overloaded and the plan failed. After the grifters had been detained, in part by the intervention of the real Silver Surfer, Nancy and Tippy-Toe got ahold of a portion of the Power Cosmic. When Tippy failed to get the scammers to repent, she passed it on to Nancy. She attempted to use it to physically punish the scam artists to teach them a lesson, but Doreen convinced her that using a position of strength to hurt people was not the answer. Nancy returned the Power Cosmic to the Silver Surfer, and afterward she and her friends were returned to Earth.
- Mew is Nancy's pet cat, which is named after Mjolnir's pronunciation, i.e. "Mewnir".
- Nancy is incredibly skilled at deducing superheroes' secret identities.
- Nancy was inspired by Unbeatable Squirrel Girl writer Ryan North's friend Lucie. The "there are three things you can do to get me to hate you" lead when she introduces herself to Doreen Green is something that Lucie said to North once in real life. Lucie also has a cat named Mew.
- Due to a lie told by Squirrel Girl, Iron Man's superhuman case files have it recorded that "Nautical Nancy" can speak to boats.
- Nancy likes to knit, sew and write fanfiction.
- From Unbeatable Squirrel Girl (Vol. 2) #1 to #5, Nancy had her hair dyed red.
- Nancy is one of the few people that Loki considers a friend, largely due to her invention of "Cat Thor".
- She is able to acknowledge the 4th wall, slightly, in her ability to see through super-hero disguises. "Oh my gosh, Doreen, seriously? Seriously. It's just a domino mask." 
- Nancy does not date because she knows "the importance of getting an education" and is "focusing on [her] studies." 
- 66 appearance(s) of Nancy Whitehead (Earth-616)
- 5 minor appearance(s) of Nancy Whitehead (Earth-616)
- 2 mention(s) of Nancy Whitehead (Earth-616)
- 79 image(s) of Nancy Whitehead (Earth-616)
- 8 quotation(s) by or about Nancy Whitehead (Earth-616)
- 1 item(s) used/owned by Nancy Whitehead (Earth-616)