C-ko Kotobuki is A-ko's best friend and has depended on her since they met in kindergarten. C-ko can be considered quite childlike. She is described as "cute" and innocent, tends to be hyperactive, and, in the Japanese version, frequently refers to herself in the third person. C-ko can often be sensitive and immature, and because of this, she has a tendency to cry. Sometimes she can also be selfish and possessive, particularly in regards to A-ko, though whether this is because of unvoiced romantic interest in her friend is unknown. Nevertheless, she is generally a nice, caring, and trusting person, especially towards her friend A-ko, and she usually means well.  In the first installment of the series, C-ko is revealed to be the Fourth Princess of the Fifth Queen of the Lepton Kingdom of Alpha Cygni, an all-female race of extraterrestrial aliens. She crash-landed on Earth when she was an infant, and the Lepton Kingdom has been searching fervently for her ever since. However, C-ko is fairly uninterested in her unearthly ancestry and wants nothing more than to remain on Earth with A-ko.  C-ko enjoys cooking, but the food that she prepares is largely inedible and often contains ingredients not meant for human consumption.  In episode three and four of the main series, we see her having trouble sleeping, usually falling off of the bed after tossing and turning. From episode one to episode three, where we see her face flattened against a toy shop window, indicating that she loves looking at dolls. From episode one and four, we learn she is an avid moviegoer, usually taking A-ko along with her to watch.  The Vs. version of C-ko is identical to her mainstream counterpart in personality, but is only ten years old, the sole daughter and heir to an incredibly wealthy man.  (Source: Wikipedia)

On a splendid morning, an effervescently cheerful teenaged schoolgirl named A-ko sets off for school with her delightfully ditzy friend, C-ko. The duo are students in a marvelous futuristic city, but A-ko is about to run afoul of the wealthy and powerful B-ko, a young lady used to getting everything she wants—and what she wants is C-ko! Also, a vast and powerful alien fleet is about to touch down in Graviton City, and they're after something, too. Fortunately for us, A-ko’s no ordinary schoolgirl—she’s got super powers of her own! 
 
(Source: Discotek)

__Birth name:__ Michie Tomizawa
__Hometown:__ Nagano, Japan (born), Takasaki, Gunma, Japan (raised)  
__Favorites:__ melon, watermelon  
__Hobbies:__ Golf, Jazz, Dancing, Shopping  
__Skills & Abilities:__ jazz dance, speaks English, stage fighting

She is the Castillian Spanish voice of Natalie Portman, Anne Hathaway, Scarlett Johansson and Keira Knightley.

Three weeks after the incident that left Captain Napolipolita's ship balancing on top of Graviton City, A-Ko and the gang go on summer vacation. While A-Ko ponders losing some weight and B-Ko devises another plan to defeat her redheaded rival to win C-Ko, Napolipolita and Spy-D experience severe homesickness - begging for a way to return to their home planet. Meanwhile, Hikari Daitokuji - B-Ko's father and the CEO of the Daitokuji Financial Group - arms the local military with new mecha to attack Napolipolita's ship and obtain its advanced technology.
 
(Source: Anime News Network)

A-ko and B-ko are bounty hunters in an untamed world. When a young heiress, C-ko, falls out of the sky and into their hair, they find themselves battling space pirates and galactic police. Turns out the high-pitched, hungry C-ko holds a secret &mdash;the spirit of an ancient evil&mdash; and is the center of a plot to destroy the universe! 

In the middle of another break from school, A-Ko dreams of finding the perfect boyfriend. Because of this, she and C-Ko get into an argument that leads to C-Ko running away and nearly getting hit by a motorcyclist named Kei. While working part-time at a fast-food restaurant to raise money for a party dress, A-Ko meets Kei and immediately falls in love with him. B-Ko happens to like him as well; however, both A-Ko and B-Ko are unaware that C-Ko is the apple of Kei's eyes.
 
(Source: Anime News Network)

In Iraq, a group of archaeologists discover ancient relics that prophecize the coming of a superior race and the end of all civilization. Meanwhile, back in Graviton City, as A-Ko and B-Ko's rivalry over Kei intensifies, Mr. Daitokuji sets up an arranged marriage between Miss Ayumi and Kei. Furious over the engagement, both A-Ko and B-Ko do whatever it takes to prevent the wedding from going through. Little do they know that another alien fleet is on its way towards Earth.
 
(Source: Anime News Network)

Shiko Kotobuki