Nana Astar Deviluke

Nana Astar Deviluke is the twin of Momo and sister to Lala. She is the second princess of Deviluke. She has the ability to speak to and understand animals. Out of all the main female cast she has shown the least attraction to Rito, regarding him as a "Beast". Although she, like the rest, has developed feelings of her own for Rito, these feelings seem closer to love for a big brother.

Appearance
Nana has long pink hair and purple eyes. In both To LOVE-Ru and To LOVE-Ru Darkness, Nana has pig tails. Like all Devilukeans, Nana also has a long black tail at her back, and like her sisters, she has a spade-shaped tail end. Nana also has a smaller bust than Momo which the latter sometimes envies. When Nana turns into "evil Nana", she acquires super human strength and she can send a bunch of big muscular men. Her pupils also become thinner and pointed!

According to VNC, her measurements are completely unknown.

Personality
She is generally far more short tempered than her twin. She also turns into "brave Nana" whenever her friends are in trouble. Examples of this event are when she desperately risks her own life just to save Haruna and her dog, when Mea is trying to scare Nana away, or when a poor little monkey is about to get hit by a truck. People have generally stated Nana becomes totally epic whenever she turns into "brave Nana". When Nana becomes "brave Nana", she becomes more bold and nurturing. Nana calls this state her protect state, a state that Haruna and Mea have commented that it has a tremendous amount of bloodlust.

Nana's most active and noticable relationship is with her twin sister Momo. While the two love each other and are often seem spending time together they are naturally polar opposites. From an early age they have always been fighting and it was only through the efforts of her elder sister Lala that there relationship remained good.

Nana envys Momo for both her confidence and her beauty. While Momo possesses a similarly developed figure to their elder sister and mother, Nana is far less developed and is very sensitive about the fact. She is also the most immature of her siblings even compared to Lala who while acting childish at times, has a very motherly and mature side.

Biography
Ever since childhood, Nana and Momo always fought. Whenever they fight, their older sister, Lala, would always make a way for them to make up, and for Zastin not to be angry with them. An example of this is when they were children, and Momo and Nana were fighting. Zastin scolded them for fighting, but Lala caused her inventions to run amok then asked for Nana and Momo's help to catch them, so that Nana and Momo will work together, and so that Zastin would direct his anger towards Lala instead. Nana first made an appearance together with Momo in Chapter 97 of the To LOVE-Ru manga. They were responsible for the Trouble Quest, an RPG game that they programmed to see the true character of Lala's friends. After seeing that Lala had great friends surrounding her, they returned to Deviluke. A few chapters later, they went back to Earth after escaping from Deviluke and their studies. However, they forgot that Zastin was also staying on Earth, and was instructed by Gid to bring the twins back home. They tried escaping, but when Nana and Momo started fighting each other, Zastin, Maul and Smutts were able to catch up to them, and a battle ensued. It was revealed that Nana and Momo also have D-Dials, but instead of gadgets, they were able to summon plants and animals, respectively. In the end, they defeated Zastin and his henchmen, and they convinced their father that they're going to stay on Earth with Lala.

During Nana and Momo's stay in the Yuuki household, they created their own house in the attic using space distortion. They also took care of all their necessities to avoid bothering Mikan for cooking, cleaning, etc. However, they still come down sometimes to eat Mikan's cooking.

Throughout the series, Nana unconcsiously develops affectionate feelings for Rito. Of course, she consciuosly dislikes him and thinks of him as a beast! Because of this, Nana usually has dreams of Rito "sexually" advancing towards her and she screams out "You beast!" in her sleep. Whenever she's asked of the situation, she glares and says, "Oh that Rito.....he's a beast!" and says no more. At this point in time, Nana was completely confused whenever her sister said, "Oh, I can always be Rito's mistress".

In To LOVE-Ru Darkness, Nana, along with her sister, become Sainan High's students, she makes friends with a girl named Mea and she gets shocked whenever Mea admits something perverted to Rito. Eventually, the friendship between Mea and Nana becomes very strong; however, Mea turns into her semi-weapon form and tells Nana that their friendship was not real! Nana was petrified and tramatized after she saw Mea's true form and personality. Rito tried to console Nana.

When that didn't technically work, Rito embraced Nana. With that hug alone, Nana finally realized what she had to do. She had to approach Mea and "open her heart". Obviously, Mea used her semi-weapon abilities to scare off Nana again; however, Nana has shown a huge amount of courage and she faced the heartless semi-weapon. Nana stood there boldly and she confessed her care for Mea. This somehow opened Mea up. Finally, Mea understood what a friend truly was. This part of the story has shown Nana's bold bravery against something quite deadly, and this has shown Nana starting to open up to Rito. In fact, she even tried to sleep in Rito's bed once.

Powers and Abilities
She shares a connection to animal life, and has the ability to communicate with them. She would always use a D-Dial that her sister made for her to summon animals and milk whenever she needs them. Like her sister, Lala, she also has the ability to shoot beams out of her tail. However, instead of a laserbeam, what she fires is technically unknown for the time being.

Like her sisters, Nana also becomes weak whenever someone touches her tail. This weakness is usually taken advantage of by Momo whenever they get into fights. However, Nana also possesses the Devilukeans' superstrength and their bloodlust, making her very dangerous in battle.

Lala Satalin Deviluke
Nana has shown very high respects for her sister, calling her "Ane-ue".

Momo Velia Deviluke
Although the twin sisters often squabble with each other over trivial things, they do love each other. In To Love-Ru, they are often seen together and often plan michievous things together, such as the virtual reality games, and running away from home to escape their studies together.

Nana envies Momo for having larger breasts than her, something that Momo doesn't hesitate to tease her about.

In To Love-Ru Darkness, they both enroll in the same school as Rito and Lala, and still do things together, but their lives become less attached and parallel to each other, and they are not as often seen together as they were before. While Nana develops her own friendship with Mea, Momo concentrates on her Harem Plan that was originally proposed by Lala.

Rito Yuuki
Nana is one of the few girls who does not have romantic feelings for Rito. In fact, her impression of him and his friendships with many girls is quite negative. She thinks of him as a shameless pervert, and is widely known for calling him a "beast". Overall, she doesn't genuinely hate him, but rather she can't seem to see what's so great about him. She has, however, said that he can be kind sometimes.

After Nana's relationship with Mea became strained and left her heartbroken, Rito came to offer her advice and encouragement. When Rito hugged her in his arms to console her, it gave her the courage to confront and reconcile with Mea. Nana notes that being hugged by Rito feels good. Her feelings for Rito greatly improved from this, and she subsequently snuck into Rito's room to sleep next to him (only to find Momo already sleeping with the Beast, much to her anger).

Unknown Mother
Not much is known about the mother of Lala, Nana and Momo. It's said that she might be the most beautiful ever someting Lala and Momo have inherited from her except for Nana (who is very sensitive about it in an aggressive way). Momo states that she's a wonderful person, as the current queen of Deviluke (in their dad's place, who isn't good at politics) she demonstrates active leadership and endeavors to maintain relations with every planet and to them she is the person they admire the most. She's always worried about her daughters and sometimes makes time in her busy schedule to call (To-Love-Ru Darkness Chapter 23)

Mea Kurosaki
After enrolling into Sainan High School along with Momo, Mea became the first friend Nana made, and Nana greatly cherishes their friendship. Unknown to Nana, at first, Mea is a living weapon, like Yami (Golden Darkness). And like Yami, Mea is not genuinely accustomed to friendship and emotions, despite her cheery exterior.

Mea convinced herself that she is a weapon who was only pretending to have emotions to follow orders as a spy in the school. When Nana discovered Mea's identity as a living weapon, Mea confessed that she was only pretending to be friends. This left Nana deeply upset. But after consolation and encouragement from Rito, Nana approached Mea again, and Mea realized that she does care for Nana. They have since become friends again.

Trivia

 * Like the other parts of the Devilukean family, Nana's second name is a reference to the demon, Astaroth.
 * The Japanese name Nana means grace ironically, due to Nana frequently shown temper and violent behavior