Goshuusho-sama Ninomiya-kun

Shungo Ninomiya (二ノ宮峻護, Ninomiya Shungo?)
Voiced by: Junji Majima
Shungo, the main character, is a talented martial artist and can even defend himself in his sleep. It seems that he met Mayu and Reika when they were kids but only Reika remembers this, yet remaining oblivious. He also seems to show little interest in women, as the girls in his school are frequently trying to get him to have intercourse with them (or at least sexually tease him anyways to try his restraint as much as possible), but as of yet, he has done his best to run away. In fact he shows almost no interest at all in women with the exception of Mayu and Reika.

Mayu Tsukimura (月村真由, Tsukimura Mayu?)
Voiced by: Mai Kadowaki
Mayu is a girl suffering from androphobia who is sent by Ryōko Ninomiya to live with Shungo to get over her fear. She and her brother are succubi, which in this series refers to people with special abilities of attracting members of the opposite sex and feeding on their life force. However, Mayu cannot control her power, which causes her to be chased by men often. She has very large breasts and frequently finds herself getting into situations where they are shown off or she puts herself into embarrassing situations, for example, getting sprayed with water from the sink while wearing a tight white shirt or frequently falling on top of Shungo in suggestive positions. She is horrible at cleaning up or tidying up places. She binds up the fringes of her hair on each side with a pair of bat's wing-like hair-clips. Though she is terribly clumsy, which often gets her into bad situations, Mayu is very lucky, which serves to bring her out of said situations. Mayu is also shown to be in love with Shungo.

Reika Hōjō (北条麗華, Hōjō Reika?)
Voiced by: Miyuki Sawashiro
Reika is the student council president at Shungo's school, and is the heiress to and executive of her father's vast corporate empire. She becomes Shungo's maid after Ryōko threatens to spread a video of her over the web. She loves Shungo and is envious of Mayu's large breasts. She had a close childhood relationship with Shungo in the past, somewhat like lovers in fact, although Shungo only vaguely remembers this in his dreams. It has been shown that, like Mayu, Reika is also a succubus. She has symptoms of BPD, that apparently the outer Reika talks to sometimes. The other side of her introduces herself as the darkness within Reika, and while the "normal" Reika speaks with an aristocratic air (by using Japanese speech that is reasonably too formal), once the "inner" Reika surfaces, the formal speech format disappears and Reika speaks in a more blunt manner. The "inner" Reika is also willing to do anything to get Shungo. She was the only one who retain her memories of her childhood, but refrains for speaking of it in fear of harm Shungo's mind.

Ryōko Ninomiya (二ノ宮涼子, Ninomiya Ryōko?)
Voiced by: Michiko Neya
Ryōko is Shungo's busty older sister. She is also a skilled martial artist and sometimes brings a camera to tape Shungo and Mayu together and provoke Shungo. She likes to mess around with her younger brother and the other girls most of the time for her own personal enjoyment.

Mikihiro Tsukimura (月村美樹彦, Tsukimura Mikihiro?)
Voiced by: Ken Narita
Mikihiro is Mayu's older brother. He is an incubus, the male counterpart of a succubus. He is very sneaky and devious, although not evil, and good at manipulating others to do what he wants, like Reika for instance. He seems to have known Ryōko for a long time, as they are often seen working together, even in flashbacks. In the anime, it is revealed that he owns a wheat farm, an animal ranch, and a fishing boat.

Mitsuru Hosaka (保坂光流, Hosaka Mitsuru?)
Voiced by: Kouki Miyata
Mitsuru, otherwise known chiefly as Hosaka, is an employee of the Hōjō organization. He is a student council member, and Reika's main assistant. He is prone to being slapped and beaten by Reika. Nonetheless, he demonstrates the ability to pack a punch himself when he manages to sneak and knock down several guards seemingly bare-handed before rescuing Shungo, Mayu and Reika one time; and being able to leap off the balcony of a multi-story building, but is simply docile towards Reika. His speed, power and agility also seems to surpass Shungo, but his endurance is low, so if a punch lands, he falls much quicker. He also, like Shungo, seems to not be affected by Mayu's succubus powers for reasons unexplained.

Shinobu Kirishima (霧島 しのぶ, Kirishima Shinobu?)
Voiced by: Saeko Chiba
Kirishima is a maid in the service of the Hōjō family. She sees it as her duty to watch over Reika. She carries a wakizashi sword. Unlike Hosaka who uses relatively casual (though not rude) speech patterns with Reika, Kirishima uses only Japanese honorifics towards Reika, but quickly reverts back to blunt speech towards Shungo, whom she thinks is not worthy of Reika, and is always trying to "execute" him. It is hinted that she may have a bit of a crush on Shungo, though she is unwilling to admit it.