Main characters ; : :A girl who is a member of her school's space yacht club and has a part time job as a waitress in a cafe. She learns one day about her recently deceased father, Gonzaemon Kato, who was a Space Pirate. As Gonzaemon's only descendant, she is chosen to become the new captain of the Bentenmaru. After joining her parents' former crew, she starts dividing her time between her studies, her part-time job and her duties aboard the Bentenmaru. It does not take long for her crewmates to confirm that Marika has what it takes to live up to her father's legacy. ; : :A mysterious girl who transfers into Marika's school after she learns of her heritage, observing her while she decides about becoming a space pirate or not. Just like Marika, Chiaki is heir to another pirate ship, the Barbaroosa. Despite claiming she does not like when Marika gets too friendly with her, she truly cares for her and always lends a hand when needed. The only breach in her cold facade is her passion for
ice parfaits, on which she partakes regularly whenever she visits the Lamp Café.
The Bentenmaru ; : :The Bentenmaru's beautiful medic and unofficial first mate, and one of the crew's veterans from Gonzaemon Kato's leadership. At Hakuho Academy, she acts as the school's doctor. ; : :The Bentenmaru's helmsman. At Hakuho Academy, he serves as adviser of the Space Yacht Club and homeroom teacher in Marika's class. ; : :The Bentenmaru's radar and sensor specialist who likes to assemble model ships in his free time. ; : :The Bentenmaru's electronic warfare specialist. She usually appears as a stereotypical nerd, constantly clad in her pajamas and thick coke bottle glasses, and eating snacks at her workstation. She is actually very attractive, but doesn't want anyone to notice, only using her looks as a last resort to get information from men. ; : :The Bentenmaru's tactical officer. He is a cyborg and was a friend of Ririka during her space pirate years. ; : :The Bentenmaru's engineer. While not busy, he enjoys collecting teddy bears. ; : :The Bentenmaru's navigator and psychic whose cryptic warnings usually anger some of her crewmates.
Hakuoh Academy ; : :Marika's closest school friend and a co-worker at the Lamp Café. Additionally, she is a member of the academy's knitting club, and has taken up the challenge of creating new "cute" uniforms for Marika's pirating job. ; : :The President of the Space Yacht club and the heir of a major space shipping conglomerate. Following the first half of the series, she graduates and passes her position to Lynn. Later on, she runs away from an arranged marriage with the help of Marika's crew and Lynn, who is revealed to be her lover. ; : :(
Rin Lambretta in the English dub) The vice-president of the Space Yacht club. A troublemaker and skilled hacker, Lynn is a
lesbian and Jenny's lover. After Jenny graduated, she took over her position as president. It was also revealed that she hacked the Nebula Cup Tournament 6 years ago and thus caused Hakuoh Academy to be suspended from participating in the race for 5 years. ; : :A member of the Space Yacht club. Graduated after Marika begins her second year at high school. ; : :A member of the Space Yacht club. Graduated after Marika begins her second year at high school. ; : :A member of the Space Yacht club who wears sunglasses. Graduated after Marika begins her second year at high school. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club. ; : :A member of the Space Yacht club who joins after Marika's second year at high school and has a natural talent as a pilot and helmsman. When the Bentenmaru's crew is hospitalized, she temporarily takes Kane's place as the ship's helmsman. She is also able to predict the wind currents in atmospheric flying and read the constellations for navigation. ; : :A member of the Space Yacht club who joins after Marika's second year at high school. ; : :A member of the Space Yacht club who joins after Marika's second year at highschool. Her expertise on old fashion engines was a great help when Marika and the Yacht Club used the Bentenmaru for a pirate job.
Serenity Kingdom Star System ; : :The Seventh Princess of the Serenity Royal Family of the Serenity Star System who knew Marika's father, Gonzaemon. Gruier hires the Bentenmaru to help her find the Golden Ghost Ship, a first-generation colony transport ship whose descendants became the firsts settlers of Serenity. In truth, Gruier wants to search the ship to find the Artificial Womb room, a lab that genetically creates and births children for the Serenity Royal family. Due to political turmoil in the Serenity Kingdom, Gruier wishes to destroy the Artificial Womb so that no new heirs will be born, believing the Royal family's time has come to an end and Serenity should embrace republicanism to revive its former glory. However, this leads to conflict with her younger sister Grunhilde, who has other plans for the Artificial Womb. It is only after Marika's intervention that she stops the rivalry between the two sisters and also saves the newest and last Serenity Royal to be born from the womb. She later attends Hakuho Academy and joins the Space Yacht Club before Marika's second year starts. Despite being a princess, she is always seen hanging out with Marika, much to Grunhilde's concern, and helps Marika whenever she is in trouble. ; : :The Eighth Princess of the Serenity Royal Family. She and her sister Gruier were in a conflict to find the legendary golden ghost ship as she wishes to use the Artificial Womb to birth a new heir that will end the Serenity Kingdom's political turmoil and revive its former glory. However, Marika manages to defuse the situation between the two sisters and repair their relationship. She later attends Hakuho Academy and joins the Space Yacht Club with her sister. At first she does not like her sister being too close to Marika as she is a pirate, but later she understand why her sister adores Marika and subsequently comes out of her own shell as well. ; : :Grand Chamberlain of the Privy Council of the Serenity Star System. ; :Head of the Serenity Royal Family bodyguards.
Space Pirates ; : :Captain of the pirate ship Barbaroosa, and father of Chiaki. He is on friendly terms with the Bentenmaru's crew and its captain. ; : :The captain of the Imperial Pirate Ship Parabellum. Wears a mask and the gold skull of a recognized Imperial Pirate. In the last episode, he is revealed to be Gonzaemon Kato, Marika's father and Ririka's husband (although he keeps his actual survival secret from his daughter) and the narrator of the series. ; : :Marika's mother and Gonzaemon's wife, who was once a space pirate herself known as "Blaster Ririka". Marika rarely calls her "Mother", instead calling her by her given name; however, Marika does call her "Mother" when she's serious. After leaving the Bentenmaru, Ririka started working as an Air Traffic Controller. Sometime after Marika becomes the captain of the Bentenmaru, she joins the crew of the Parabellum, under Captain Ironbeard. ; : :Kane's younger twin brother and helmsman of the Parabellum. ; : :Captain and pilot of the Grand Cross, a giant, next-generation experimental battleship. An Imperial Pirate, she battle tested the Grand Cross by destroying the space pirates of the frontier worlds, believing they no longer act like the pirates of old. It is only after the frontier pirates united under Marika's leadership that she is defeated. Quartz is hinted to be royalty due to the way Ironbeard talks to her and her relationship with the Empress of the Galactic Empire.
Others ; : :The flamboyant head of the Harold Lloyd Insurance Union, and successor of the previous president, Harold, with whom the crew of the Bentenmaru - Ririka in particular - had often come to blows over professional issues. He acts both as an insurance agent for high-risk clients (such as pirates and cruise ships) and as an agent for the pirates, negotiating and setting up their "jobs" (such as flashy pirate attacks on cruise ships for the entertainment of the passengers). ; : :A chef who runs an inconspicuous restaurant known only to pirates (and ex-pirates), and it is revealed that he is the son of the Legendary Chef who long ago united all pirates to fight in the War of Independence. ; : :The head chef of the Pirate's Nest. Inheriting his father's title, he runs the Pirate's Nest, a neutral space station where space pirates meet and eat together, whether they be frontier or imperial space pirates. ; : :Uncle of Jenny Doolittle and chairman of the Hugh and Dolittle interstellar transport company. Fearing Jenny rather than his son will inherit the company, he arranges a marriage between Jenny and a politician to prevent it. However, he is thwarted by Marika and her friends when they expose Jenny's fiance as the leader of an anti-government revolutionist group and Robert himself secretly selling illegal weapons to politicians and rebels. ==Media==