He is a kind, 16-year-old high school student at Sainan High who is famously known for his extreme clumsiness and accidentally landing in compromising, accidental pervert situations with the female cast. Deeply empathetic, protective, and respectful toward others, always looking out for his friends and family.Clumsy & Unlucky: Possesses a running gag/supernatural-level misfortune of tripping and accidentally groping or landing on girls.

16-year-old girl with long bubble-gum pink hair, emerald-green eyes, and a curvaceous figure.Tail: A thin, whip-like alien tail with a heart-shaped tip that can shoot lasers, though it is extremely sensitive.Peke: Her transforming robot companion, which usually functions as her hair clip and forms her clothing. The first princess of the planet Deviluke, she ran away from home to escape a barrage of forced arranged marriages to galactic suitors. She initially latched onto Rito Yuki as a fake fiancé to deter her father, but genuinely grew to love him over time. She is also a genius inventor.

is Nana's twin, as well as Lala's younger sister. As Gid's daughter, she holds the title of "Third Princess of Deviluke" as she is the youngest out of his three daughters. Her tail is a major weak point to her. Appears sweet and feminine but is highly intelligent, strategic, and sometimes manipulative, especially when it comes to her “harem plan” for Rito. Can speak to plants and uses alien technology, including a D-Dial to summon plants. Short pink hair and purple eyes, often noted as attractive with sizable breast.

is the twin of Momo and the younger sister of Lala. She is the second princess of Deviluke. She has the ability to talk to and understand animals. Has a long black tail, a fang on her upper jaw, and a smaller bust size than her twin, Momo, which she dislikes being teased about. Tomboyish, short-tempered, and impatient, but also athletic and caring towards her friends. Devilukean/Charmian hybrid, giving her enhanced physical abilities and animal communication skills.

Run has hot pink eyes and has long light green hair with two points sticking out at the top. Her body appears slender and curvy. is a childhood friend of Lala and the female form of Ren Elsie Jewelria. As Run and Ren are royalty from planet Memorze, they can change gender in mind and body upon triggering a specific stimulus; in their case, a sneeze. Run's personality can be described as determined and obsessive but also quite charming and sweet. As she is an Idol, she works really hard and loves what she does.

She is in Rito's class and is the girl of his affections. Haruna has similar feelings for him, having been attracted to him because of his kind, gentle nature since junior high, but believes them to be unrequited and has not built up the nerve to confess to him. Despite her growing love for Rito, her friendship with Lala causes her to suppress her feelings since she doesn't want to hurt Lala who also loves Rito. Haruna has blue hair and purple eyes, she has quite a cute complexion which most boys seem to like. She always wears a red vertical hair clip on the left of her head. Haruna is quite skilled in tennis, as she is a member of the tennis team and club.

Mea has violet/blue colored eyes and red hair with a really long braid. The upper part of her hair resembles Yami’s hairstyle. She also has a violet colored hair clip with an indigo colored cross on it and hair coming below it that's similar (yet smaller) to her braid. Mea has a laid-back, mischievous and childish personality, bordering on the psychotic side sometimes. She is rarely not smiling, particularly in combat, acts friendly to friend and foe alike, and often says "wonderful" if something unfortunately perverted happens. Mea has a sweet tooth and likes anything sweet, preferring to put so many sugar cubes in her tea that they pile out the top of the cup. She seems to enjoy messing with and teasing people.

Yami has long blonde hair, dark red eyes, and a child-like figure. The older sister of Mea, both transweapons, Her 3-sizes are B75-W52-H77. Although it should be noted that she can change her appearance to look older with her transformation ability, her choice to remain in her child-like form is most likely due to the fact that it is comfortable when in combat. Though she does come off as stoic, emotionless, and withdrawn in actuality she is pretty kind, but she would attack people who talks about something that she doesn't like. She also hates perverted people and normally attacks Rito (despite knowing it’s not his intention), who by his clumsy nature trips into her and gropes her.

Yui has waist-length black hair that has long bangs hanging over her forehead, golden eyes. In contrast to her prudish nature, Yui sports a nearly identical curvaceous figure to Lala, is a high-strung and uptight girl, she has little to no tolerance for anything perverted, students who bring personal items to school, misbehaving, or whatever she does not consider to be "acceptable behavior".