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's 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
She is generally sweeter than her twin, 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. 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 in the sports shed; 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 deadly. 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 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. Zastin scolded them for 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 so that Zastin would direct his anger towards 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, 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 Momo and Nana started fighting each other, Zastin, Maul and Smutts were able to catch up to them, and a battle ensued. 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 henchmen, and they 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 his being the fiance 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 sleeping. Momo has also stated that she knows Rito would not reciprocate her feelings, and that she's contented just to be a lover.

In To LOVE-Ru Darkness, Momo organizes 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. Of course, Momo also manipulates situations so she can get a romantic situation with Rito. So far, Lala, Haruna, Nana, Yui, Yami, Mikan, and Run are part of Momo's "Harem Plan", with Saki, Rin, Mea and even Dr. Tearju under consideration. As of now, Momo's plan is gradually taking effect as initially, Rito rejects the idea, but now is considering it. Momo's Harem Plan is getting a lot of momentum thanks to those "That horrible Beast!" speeches. Talking about more irony, these "beast" speeches seem to attract the girls to Rito more, especially Mea. These "horrible beast" statements are made possible by her twin sister, Nana.

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' superstrength 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.

Lala Satalin Deviluke
Momo has shown very high respects for her sister, even 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 contented 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
Despite constantly fighting with her twin, Momo has shown to care deeply for Nana. Momo even goes so far as to include Nana in Rito's "Harem Plan".

Trivia

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