The younger sister of Lala and the twin sister of Momo Velia Deviluke and the 2nd Princess of Deviluke.
Nana, along with her twin, followed the example of Lala and fled from Deviluke to come to Earth. Although for entirely different reasons, both of them fled because neither wanted to study the history of planet Deviluke. Which fits perfectly with the relative childish nature of the both of them.
Nana is the responsible one out of the pair and tries (unsuccessfully) to keep her more mischievous twin in check. She becomes suspicious of Momo after her twin starts to sneak into Rito's room at night, stating that Momo is going to mess up the relationship with Lala (fat chance of that), however, Nana starts to understand where her twin is coming from when Rito stops her from falling down a steep hill.
Nana has long, pink hair and a single sharp visible tooth. She constantly wonders why so many girls love rito, even thought she has small feelings for him too.
Nana, unlike her twin, has a connection to animals, and has a dialer (cell phone) that allows her to summon the animal she wants at a moments notice.
Nana is also completely flat-chested, to her considerable disappointment (seriously, look who she has for an older sister) and she tries various different "methods" to try and enhance her non-existent bust, going to far as to summon a plant that would pull on her breasts to increase her chest size!
In To Love Ru Darkness. Nana Went to Sainan High along with her twin sister, shes always thinking deeply about the thing that Rito said on the pool. She met Mea and Became Best Friends, She always warn her about Rito that he is a Beast. She always gets angry to Momo thinking that Momo is Pretending to be good. She also Learned something that Rito didnt look unhappy about her even her breasts are small.