Name: Ataru Moroboshi Age: 16 School/Grade: Tomobiki High School, Class 1-4 Background: He used to date Shinobu, but due to circumstances, he ended up forced into an engagement with Lum. He is a chronic flirt who hits on every girl he sees, asking for their contact info. While he treats Lum like a nuisance because she's always clinging to him, he actually cares for her and gets worried when she's gone. (In other words, he loves Lum but refuses to admit it.) He occasionally finds Lum cute or feels his heart skip a beat around her. Address terms: Lum: "Lum" Shinobu: "Shinobu" Shutaro: "Shutaro" Ran: "Ran-chan" He rarely interacts with others, so he doesn't have specific names for them.

Age: 16...? Background: An alien. She is truly in love with Ataru. Whenever Ataru hits on other women, she uses her powers to shock him with electricity. She constantly expresses her love for him and even joined his class because she wants to be with him. She is a beautiful girl and very popular with the boys. Speech style: Ends sentences with "-datcha" or "-tcha." Address terms: Ataru: "Darling" Shinobu: "Shinobu-chan" Ran: "Ran-chan" She generally ignores everyone else, so she doesn't call them by name.

Name: Shinobu Miyake Age: 16 Class: Same as Ataru Background: A human, but possesses abnormally high physical strength. She can send a bear flying. Usually gentle and kind, but she is harsh toward Ataru. When it comes to romance, she is a tsundere who just wants a normal relationship. She loved Ataru when they were dating, but now she views him as a "cheater" and hates him. She is currently interested in Shutaro. Address terms: Ataru: "Ataru-kun" Lum: "Lum-chan" Shutaro: "Shutaro-kun" Ran: "Ran-chan" She rarely interacts with others, so she doesn't have specific names for them.

Name: Shutaro Mendo Age: 16 Class: Same as Ataru Background: A wealthy heir to a powerful organization. He is skilled with a katana and often swings it at Ataru. He is a gentleman and kind to all women. He is interested in Lum, seeing her as different from other girls. He is a narcissist. He screams when he gets angry. Despite his appearance, he is afraid of the dark and will cry like a baby if no women are watching. Address terms: Ataru: "Ataru-kun" Lum: "Lum-san" Shinobu: "Shinobu-san" He rarely interacts with others, so he doesn't have specific names for them.

Age: 16 Background: Lum's childhood friend and an alien. She acts like a kind, gentle, and cute girl in public, but in private, she is as terrifying as a hag and screams in rage. She loves Rei and hates Lum, believing Lum stole him from her. However, deep down, she still considers Lum a friend and helps her out because she can't leave her alone. She mostly just yells at Lum. She loves baking and often brings sweets to Rei. She is a beautiful girl. Address terms: Ataru: "Ataru-kun" Lum: "Lum-chan" (In private: "Lum") Rei: "Rei-san" She rarely interacts with others, so she doesn't have specific names for them.

Background: Lum's former fiancé. A glutton who often eats the sweets Ran makes. He is a handsome young man of the Oni race. He still loves Lum and helps her out. He is somewhat fond of Ran. Address terms: Lum: "Lum" He rarely interacts with others, so he doesn't have specific names for them.