Momo Belia Deviluke

Momo Belia Deviluke is Nana's twin sister as well as Lala's little sister. Momo is sometimes referred to as the "Third Princess of Deviluke", since she is the youngest of the three princesses.

Appearance
Momo has short pink hair and purple eyes. In the To LOVE-Ru manga, Momo's hair was frizzy, but in the beginning of To LOVE-Ru Darkness, Momo straightened her hair out, in hopes that Rito will see her as more mature. Like all Devilukeans, Momo has a long black tail at her back, and like her sisters, she has a spade-shaped tail end. Momo also has a bigger bust than Nana, which the latter sometimes envies. When Momo turns into "evil Momo", she acquires a short fang similar to Nana's except that Nana's fang is on her right side while Momo's is on her left side. Her pupils also become thinner and pointed.

According to VMC, her measurements are 80-54-79 (estimate).

Personality
While other characters would describe her as sweet, kindhearted and innocent, the real Momo is, above all else, highly perverted, a side of herself which she doesn't show to others in school, and which opens up to Rito, whom she loves and lusts for. She often fantasizes perverted situations with Rito, and desires for him to become sexually active towards her. She often sneaks into his bed at night to sleep with him because, in his sleep, he becomes much more frisky and physically active than he is aware of.

Momo is also known for her yandere tendencies, which some characters who truly know her would describe to be the real Momo. She is generally sweeter than her twin sister, but develops a bad attitude whenever Nana takes credit for something she does. She also turns into "evil Momo" whenever her friends are in trouble. Some examples of this event are when Nana and Yami were in trouble in Planet Mistletoe, when the VMC planned to beat up Rito for bringing Momo into the sports shed, and when Yami, Mikan and Rito were cornered by Azenda. People have generally stated that Momo becomes very scary whenever she turns into "evil Momo". When Momo becomes "evil Momo", she becomes more mischievous and hostile. Momo calls this her battle state, a state which Yami and Mea have commented has a tremendous amount of bloodlust.

Biography
Ever since childhood, Momo and Nana always argued. Whenever they fight, their older sister, Lala, would always arrange ways 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, but Lala caused her inventions to run amok then asked for Momo and Nana's help to catch them, so that Momo and Nana will work together, and Zastin would scold Lala instead.

Momo first made an appearance together with Nana in Chapter 97 of the To LOVE-Ru manga. They were responsible for the Trouble Quest, a virtual reality RPG game that they programmed to observe 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, who was instructed by their father to bring the them back home. It was revealed that Momo and Nana 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 assistants, and convinced their father that they're going to stay on Earth with Lala.

During Momo and Nana'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, Momo gradually developed affectionate feelings for Rito despite him being the fiancé of her sister. Because of this, Momo would constantly sneak into Rito's room, sometimes even half-naked, revealing Momo's lustful side. Whenever she's asked of the situation, she simply says that she accidentally gets into Rito's room while she's half asleep. Momo has also stated that she knows Rito would not reciprocate her feelings, and that she's content just to be a lover.

In To LOVE-Ru Darkness, Momo organizes her "Harem Plan", a plan so that her sister can still marry Rito, and at the same time, Momo's love for Rito would be reciprocated. The first phase of her plan was to get into Sainan High so that she can monitor Rito and the female characters closely. The second phase was to turn Rito into a "carnivore" so that he would take it upon himself to create a harem. To do this, she manipulates the situation so that Rito would end up in a romantic situation with one of the female characters that have feelings for him. Of course, Momo also manipulates situations so she can get a romantic situation with Rito. So far herself, Lala, Haruna, Nana, Yui, Yami, Mikan, Run and even Mikan (dispite being his sister) are part of her "Harem Plan", with Mio, Risa, Mea, Oshizu, Kyouko and even Dr. Tearju under consideration to be part of the plan but it's still unofficial as to whether or not they'll be part of the plan in the end. As of now, Momo's plan is gradually taking effect as initially, Rito rejects the idea, but now is considering it.

Powers and Abilities
She shares a connection to plant life, and has the ability to communicate with them. She would always use a D-Dial that her sister made for her to summon plants and fruits 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, she fires lightning.

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

Rito Yuuki
She has a strong attraction towards Rito (which is similar to Lala's but more lustful). She has stated how his facial expressions are lovely, letting him touch her tail, and even becoming more aroused when Nana refers to him as a "beast". At one point in time, she nearly stated how jealous she was of Lala that Rito's hand was stuck to her tail.

In To Love-Ru Darkness, Momo still seeks Rito's love, but unwilling to cause conflict between her sister or Haruna, Momo realizes if Rito becomes the next king of Deviluke, Earth laws will not apply to him, allowing him to create a harem where she can display her affections openly, and make Lala and the rest of their female friends happy at the same time.

Momo explains that she first noticed Rito when the latter desperately tried to save Celine, whom he had considered as family despite the inability to communicate with plants. Her affections developed further when Rito pretended to be Peke for her sake, so that she would not get into trouble for the mistake she caused.

Rito show's a great deal of care for Momo her siblings, like when he asked her what kind of person their mother is and if she and her sisters feel lonely not being able to see their mother, she answers no saying that she has her sisters and Rito too and says if possible she wants to be with him from now and forever.

Lala Satalin Deviluke
Momo has shown very high respects for her sister, calling her "onee-sama". Momo's respect was also shown when she did not try to steal Rito from her, and instead decided to be content with being a lover. However, Momo has since found a compromise so that her sister would not be heartbroken, and Momo can still be happy.

Nana Aster Deviluke
Like any siblings, Nana and Momo often squabble over trivial things, such as Nana's chest, which Momo doesn't hesitate to tease her about. Despite constantly fighting with her twin sister, they both care for each other. She is even including Nana in her "Harem Plan".

In To Love-Ru, they are often seen together, and are often doing things together, such as planning the virtual reality games, and running away from their studies. 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.

Mikan Yuuki
Although she at first welcomed Lala's little sisters into her home, Mikan and Momo's relationship has grown humorously adversarial when Rito is involved. Strangely, while she doesn't mind the childish Lala clinging onto Rito and sleeping naked next to him, Mikan has a particular dislike of Momo's more mature doting and more sexual advances with Rito. Mikan has become something of an obstacle to Momo, barring Momo's access to Rito and guarding Rito's room at night to prevent Momo from sneaking in at night. She even becomes uneasy when she is forced to leave them  alone together at home, and she would rush straight home to prevent Momo from doing anything to Rito.

Interestingly, Momo's existence in Mikan's life has become similar to what Lala's existance was like to Rito. Lala adds new dynamic to Rito's relationship with Haruna, and while none of them hate each other, Rito does put up with much abuse from Lala's inventions and eccentricities. And while Momo plays a role in Mikan's relationship with Rito, her eccentricities have also become the bane of Mikan's normal life. She "helped" Mikan get together with Rito while Mikan was under the influence of Celine's pollen. And she used Lala's invention to turn Rito into a pair panties for Mikan to unknowingly wear so that Rito can find out what's bothering her at school.

Unknown Mother
Not much is known about the mother of Lala, Nana and Momo. It's said that she might be the most beautiful woman ever, something Lala and Momo have inherited from her, but not Nana as much (who is very sensitive about it). Momo states that she's a wonderful person. As the current queen of Deviluke (in their father's place, who isn't good at politics), she demonstrates active leadership and endeavors to maintain relations with every planet. To Momo and her sisters, she is the person they admire the most.

Momo has stated that despite being busy most of the time, their mother still makes time to call them (To-Love-Ru Darkness Chapter 23).

Mea Kurosaki
Mea can get on Momo's nerves when she mischievously interferes with her relationship with Rito and the harem plan. But for the most part, they do get along fine and would hang out together with Nana. They also share some perverted interests such as when Momo tries to bring Rito and Run closer together, they both get excited about what ecchi moment is going to happen with them, and they both enjoy licking on Rito's (as Riko Yuusaki) female body.

Trivia

 * Like the other parts of the Devilukean family, Momo's second name is a reference to the demon, Belial.