TV-Series
Description
Momo Belia Deviluke is the third princess of Planet Deviluke, the youngest daughter of King Gid Lucione Deviluke and Queen Sephie Michaela Deviluke. She is the younger twin sister of Nana Astar Deviluke and the younger sister of Lala Satalin Deviluke. Physically, Momo possesses short pink hair, purple eyes, and a Devilukean tail ending in a spade shape. She stands 151 cm tall and weighs 45 kg, with measurements of B80-W54-H79 in later appearances, a slight increase from her earlier B78-W54-H78. An "evil Momo" battle state manifests with a short fang on her right side, thin pointed pupils, and intense bloodlust.

Her personality presents a stark duality. While publicly perceived as sweet, kindhearted, and innocent, she privately exhibits a highly perverted nature. She obsessively fantasizes about sexual situations involving Rito Yuuki and actively seeks physical intimacy, often sneaking into his bed half-naked to exploit his unconscious frisky behavior. This hidden persona includes haraguro tendencies, making her manipulative, calculating, and occasionally sadistic when protecting friends or confronting threats. She displays fierce protectiveness, notably threatening the Venus Momo Club after they assaulted Rito and intervening during conflicts involving Nana, Yami, or Azenda.

Momo possesses standard Devilukean physical abilities, including superhuman strength. Her tail can emit lightning, particularly potent when combined with Nana's. A unique trait is her ability to communicate with plants, stemming from her Charmian ancestry. This connection allows her to summon extraterrestrial flora via her D-Dial device for combat or utility. She also demonstrates technological proficiency, creating virtual environments like the game Trouble Quest and generating force fields, though her skills are less advanced than Lala's.

Her history involves frequent childhood arguments with Nana, mitigated by Lala's interventions. She traveled space before arriving on Earth, befriending diverse plant species. Initially appearing alongside Nana in the "Trouble Quest" arc, they later moved into the Yuki household using space distortion technology to reside in the attic. Over time, Momo developed romantic feelings for Rito. In the Darkness storyline, she orchestrates the "Harem Plan": a strategy to position Rito as Deviluke's future king, enabling him to legally marry multiple partners under intergalactic law. This plan aims to include herself, Lala, Haruna, Nana, Mikan, Golden Darkness, and others while gradually manipulating scenarios to foster romantic connections between Rito and these women.

Her emotional development centers on reconciling her professed acceptance of the harem structure with deepening personal doubts. After her mother Sephie visits and questions her true satisfaction with the plan, Momo experiences visible distress when witnessing Rito's accidental kiss with Haruna, feeling "like a loser." Though momentarily relieved when their confession attempts fail, Lala's reaffirmation of unconditional love for Rito renews Momo's resolve to continue the Harem Plan despite her internal conflict.