Female. Height: 165cm. Weight: 50.5kg. Measurements: B89 (G-cup) / W57 / H87. Skills: Inventing, martial arts. Likes: Clam miso soup, Magical Kyoko. Dislikes: Having her tail touched. Family: Father (Gid), Mother (Sephi), Sisters (Nana and Momo). The First Princess of Planet Deviluke, she has long pink hair. Fed up with a life of endless arranged marriage meetings on Deviluke, she fled her home planet and came to Earth. She fell in love at first sight with Guest, whom she happened to meet upon arrival, and is now living as a squatter while striving to become Guest's ideal bride. Despite her very slender waist, she has a G-cup bust, giving her one of the best figures among the heroines. She has a devil-like tail growing from her backside; if this tail is toyed with, she writhes in agony much like a Saiyan (a trait common to all Devilukeans). She possesses incredible physical strength and high athletic ability, with combat skills that allow her to fight on par with Golden Darkness. As an alien, her behavior often defies Earth's common sense, frequently shocking those around her. A prime example is her tendency to appear stark naked in public without a second thought. Lala usually doesn't wear clothes, instead wearing a robot named Peke who customizes various outfits for her. Even if Peke falls off for some reason or runs out of battery (causing her clothes to vanish), she remains unashamedly naked. (However, she did show embarrassment when Guest looked directly between her legs). She is highly intelligent and achieves excellent grades, using her brilliance to develop a wide variety of inventions. (She scored a zero on her initial entrance exam at Sainan High School, but that was only because she hadn't learned Earth's writing system yet and couldn't show her true potential). However, her inventions often have flaws or fail to produce the intended effect, frequently leading to lewd mishaps.

Female. Height: 160cm. Weight: 50kg. Measurements: B79 / W56 / H82. Bust size: B. Skill: Tennis. Likes: Her pet Marron, apples, black tea. Dislikes: Ghosts, dark places. She has short blue hair and uses a hairpin to show her forehead. She has a gentle, refined personality and good grades. A member of the tennis club. She has a cowardly side and will burst into tears if she encounters a haunted house or a dark place. When her fear reaches its limit, she enters a berserk state where no one can stop her (possessing monstrous strength that makes even Lala, who has superhuman abilities, say "Haruna is amazing!" and Yami remark "Impressive..."). However, she has the strength to lead others when it counts. She has been Guest's classmate since middle school. She likes Guest, but because she is awkward and shy in love, she has been unable to confess her feelings (the same applies to Guest). Although neither has realized it, she and Guest are mutually in love. She lives apart from her parents and owns a dog named Marron. Since she attended cooking classes in elementary school, she is quite skilled at cooking and handles the meals at home. She has a complex about her small chest and drinks milk and does push-ups, but they don't seem to get any bigger. However, she is clearly well-endowed (estimated C-cup); it's just that the people around her are outliers.

Female. Height: 162cm. Weight: 51kg. Measurements: B88 / W59 / H87. Bust size: F-cup. Skill: Eiken Grade 2 (English proficiency). Likes: Cats, reading. Dislikes: Swimming, running. She has long black hair and sharp, amber eyes, serving as the tsundere of the group. When they first met, Golden Darkness and Nana often mispronounced her name as "Kokegawa." Her personality is extremely serious and strong-willed. As a member of the Public Morals Committee, she has a habit of trying to discipline the slovenly behavior the protagonists exhibit even in their private lives. She hates anything irrational or lewd, and when she witnesses such scenes, she screams, "How lewd!" While she has a great figure, she ironically suffers more sexual harassment than the other heroines, causing her character to shift from a hard-liner to the primary fanservice and delusion-prone character.

Female. Height: 153cm. Weight: 45kg. Measurements: B75 / W52 / H77. Bust size: B. Skills: Transformation (Trans) ability, martial arts. Likes: Taiyaki, reading. Dislikes: Slimy things. She possesses the "Trans" ability, allowing her to freely transform parts of her body into any shape at will. She has been alone since birth and lived a hard life as an assassin, finding no value in her own existence. Having survived various battlefields and completed life-threatening missions, she came to be known as the "greatest assassin in the universe." "Golden Darkness" is a code name; her real name has never been revealed. Those around her usually call her "Yami-chan," "Yami-san," or just "Yami." She descended to Earth after receiving an order for an assassination. However, when she actually interacted with her target, Rito, he treated her with kindness—such as giving her taiyaki, which would become her favorite food. Seeing that he didn't fight back and only ran away, she began to doubt the information she had been given. Lacospo, the client, eventually appeared, impatient that Rito hadn't been eliminated yet. She confronted Lacospo about the fact that the information claiming "Rito Yuuki is a villain plotting to trick Lala and take over Planet Deviluke" was a complete lie. When he attacked her in a rage, the contract was effectively nullified. After Lacospo was repelled by Lala, Rito suggested she return to space. However, she lives by the motto that "a job once accepted must be completed," and she also wanted to become friends with Lala, who had called her cute. Thus, she declared that she would eventually kill her target, Rito (though she claims she is only letting him live on a whim). She decided to stay on Earth to keep him under surveillance.