Atalum

Atalum is the het ship between Ataru Moroboshi and Lum from the Urusei Yatsura fandom.

Canon
Ataru and Lum meet when the oni (the extraterrestrial race to which Lum belongs) decide to invade Earth. The oni laws require that the representative of their species (Lum) first face the representative of the planet to be invaded in a tag match. This representative is chosen at random by a computer and the choice falls on Ataru Moroboshi. If the human representative wins, the oni will give up the invasion and leave. Ataru initially has no intention of participating, but when he finds out that it's just a game of tag and that he has to challenge a beautiful girl, he agrees that it will be easy and plans to use the competition as an excuse to touch Lum. When he sees her he is very impressed by her appearance, but this means little since Ataru is the horniest individual in the universe and therefore adores all beautiful girls. The competition will last ten days, but from the beginning Ataru discovers that it won't be as easy as he thought, since Lum is able to fly. In the following nine days the boy tries everything, but fails to catch the alien. The evening before the last day Ataru is now desperate and therefore his girlfriend Shinobu to motivate him tells him that if he can take Lum, she will marry him. This has the desired effect and Ataru devises a plan to take the beautiful oni: since the latter is wearing only a bikini, Ataru takes her bra and when she flies towards him to take it back, he takes the opportunity to touch her horns, winning the challenge. Euphoric Ataru exclaims that now he can finally get married, but since she can't know that he's referring to Shinobu, Lum believes that the boy is asking for her hand and accepts happily. Ataru tries to clear up the misunderstanding, but Lum doesn't listen to him. Shortly after the girl returns to her planet to be able to obtain permits to be able to live on Earth. A group of Ataru's schoolmates, who have fallen in love with the beautiful alien, kidnap the young Moroboshi to force him to send a signal that will make her return immediately. However, the students make a mistake and call a space taxi that takes everyone to Ataru's house. The ride comes at a steep price that Ataru and his classmates can't afford, so the aliens make up for it by attacking Earth's oil resources. The people blame Ataru and try to lynch him, but the boy is saved by the return of Lum who has completed the necessary procedures for his transfer. The girl is delighted to see her betrothed again, and immediately embraces him, then proposing to pay for the fare. In exchange, however, she wants the boy to agree to live with her. The young Moroboshi has no intention of it, which makes the oni cry, but in the end he understands that he has no choice but to give in to the blackmail. As soon as Ataru agrees to let her live in his house, the girl stops crying and pays the ride, jumping on Ataru again. Lum immediately shows a total and obsessive love towards Ataru, coming to follow him everywhere saying that "Husband and wife must always be together". Obviously Ataru is very annoyed by it, both because of Lum's intrusiveness, because Shinobu is logically not happy with Lum's presence, and furthermore she attracts the envy of his classmates. Lum often shows her affection for Ataru, hugging him, rubbing up against him, and fondling him with sweet names. Despite his lasciviousness, Ataru will never try to encourage Lum's behavior, nor will he give in to her attempts at seduction: probably because if he had sex with her, Lum would have every right to consider herself his wife. After a while, Rei, Lum's ex-boyfriend, arrives on Earth in an attempt to win her back and, having run into Shinobu, has her accompany him to Ataru's house.

Fanon
Atalum is the most popular ship in Urusei Yatsura's fandom. It's rival of Atashino.

Fandom

 * FAN FICTION
 * Ataru/Lum on Fanfiction.net

Trivia

 * Lum was originally supposed to appear only at the beginning of Urusei Yatsura, but she gained such popularity with readers that Rumiko Takahashi decided to make her the co-star of the work.
 * The popularity of Atalum prompted Rumiko Takahashi to draw inspiration from it for the relationships of the protagonists of her later works, also giving them a love-hate relationship.