Fuuko is a first year student at Tomoya's school (Technically, her age is same as Tomoya's), but she is always alone by herself, making wood carvings of starfish with a small knife to give to others as presents for her sister's upcoming wedding. Whenever Fuuko sees something she thinks is incredibly cute, she completely loses awareness of her surroundings, which Tomoya takes advantage of by playing a variety of pranks on her. In ~After Story~

Lum (also referred to in English dubs as Lamù) is a beautiful Oni alien who is capable of flying and generating electrical shocks. She is extremely popular and is famous for ending her sentences with ~datcha (loosely translated as "yes?" or "you know?"). Except when in her school girl's uniform, she usually wears a sexy outfit consisting of a tiger-striped bikini and knee-high go-go boots. While generally good-natured, sweet, and innocent, Lum also has a very hot temper. Her dream in life is to live in a "Sweet Home with Darling" in which she keeps house and raises babies while Ataru works. Unfortunately, Lum's idea of "cooking" is to take very spicy ingredients like jalapenos, cayenne peppers, and Tabasco sauce and irradiate them with an alien energy bazooka until they carbonize into inedible, crystallized nuggets. As an alien she has access to many bizarre gadgets whose use she really doesn't understand all that well, leading to comedic results. Differences between human and "Invader" physiology also drive many stories, like the time Lum's horns begin to grow larger after she is bitten by a cow, or the time she becomes drunk by eating pickled plums. (Source: Wikipedia)