The Galilei Sisters
- Affectionate Nickname: They refer each other with nicknames.
- Blonde, Brunette, Redhead: Hazuki, Kazuki and Hozuki, respectively.
- But Not Too Foreign: Half-Japanese on their father's side.
- Color-Coded Characters: Hozuki is red, Kazuki is blue, and Hazuki is yellow
- Freudian Trio: Hazuki is The Mccoy, Hozuki is The Kirk and Kazuki is The Spock.
- Heroic Lineage: Direct descendents of Galileo Galilei.
- Red Eyes, Take Warning: The three of them have reddish-purple/magenta eyes.
Hozuki Ferrari
Voiced by: Rina Hidaka
- Affectionate Nickname: She is called Hocchii or Hocchibi by her sisters.
- Apologetic Attacker: She's really sorry she destroyed your Humongous Mecha, Mr. Bad Guy.
- Badass Adorable: Cute, tiny, awkward... has a self-built arsenal of high-tech weapons, including a flying mecha-goldfish with homing missile launchers and a machine gun. She is afraid to use them, but that won't stop her.
- Beauty Is Never Tarnished: Falls from several stories high onto a pile of cars in episode four, and doesn't have so much as a scratch or bruise.
- Beware the Nice Ones: They may employ heavy artillery.
- Daddy's Girl: And is not happy that the new security arrangement means she'll have to live with mom instead.
- Gadgeteer Genius: builder of a transforming rocket-scooter-gun and a flying mecha-goldfish, among other things.
- I Let Gwen Stacy Die: She still feels rather unnerved by Leo's death and her inability to stop it; when Roberto starts a killing spree at the hospital, she's the one to stop him, remembering her lost friend.
- Kid from the Future: When she ends up in Galileo's time.
- Kid Hero: Well, she's 13. But her childish personality certainly counts.
- Rough Overalls: Hozuki wears overalls with no shirt during a very brief scene in the title sequence, in which she is seen taking a wrench to her fish-mecha. This is apparently the only time she wears overalls, as her primary outfit in the anime is a red dress.
- Teen Genius: Only thirteen years old and she's already creating impossibly high-tech gadgets.
- Token Mini-Moe: The youngest character of the series.
Kazuki Ferrari
Voiced by: Rumi Ōkubo
- Action Girl: Black-suited man on top of you with a knife to your throat? Just crush his throat in first.
- Affectionate Nickname: She is called Kakki by Hazuki.
- All Love Is Unrequited: She has a crush on an as-of-yet unnamed boy at her school, but her fugitive status will likely keep her from getting the chance to confess.
- Home Sweet Home: Kazuki really wishes her sisters would drop her off at home and leave her out of the whole "globetrotting fugitives" thing.
- I Just Want to Be Special: She's very jealous of Hozuki for her technical skills, and wishes that she could also live up to her lineage in terms of sheer talent.
- Ineffectual Loner: Known for skipping classes to escape group activities.
- Refusal of the Call: She's very eager to give the Adni Moon company what they want, thinking that they'd let them go and leave them alone, allowing them to return to their normal lives.
- Smitten Teenage Girl: Introduced skipping class and mooning over an unrequited crush.
Hazuki Ferrari
Voiced by: Kei Shindō
- The Alcoholic: Sometimes doesn't even wait for the sun to go down before getting smashed.
- Cloudcuckoolander: Her reaction to being slammed against the wall by a kidnapper? Attempt to negotiate an out-of-court settlement.Hazuki: Sexual assault is a felony! You'll get ten years for rape! Add assault to that and you can get a death sentence! We can settle out of court, but if you don't let me go right now, I'll press charges!
- Hot-Blooded: Gets really fired up about law, even if she's not terribly good at it.
- Nice Girl: She insists on giving some of their scarce food supplies to a homeless man they meet, she says that that's the right thing to do and people should help each other out.
Cicinho
Voiced by: Hiroshi Kamiya
- Affably Evil: He'll even invite his hostages to watch the World Cup prelims with him.
- Big Damn Heroes: He pretty much saves the girls in episode 3.
- Braids, Beads and Buckskins: Despite not being remotely Native American.
- Card-Carrying Villain: Regardless of whether or not he's actually evil, he certainly loves playing the part - just look at the grin on his face when he declares "We Will Meet Again!"
- Foe Romantic Subtext: From his interactions with the Galilei Sisters, it's hard to tell if he sees them as Worthy Opponents or just has a giant Villainous Crush on Hazuki.
- Honor Before Reason: Calls off his own attack on "Bambina" and her cohorts because they were distracted by Hozuki's almost-mortal injury, so he felt it wasn't a fair fight.
- Laughably Evil: Cicinho appears to have gone into piracy not for the treasure but for teh lulz.
- Love at First Punch: While Hazuki didn't exactly punch him, when she stood up and verbally punched him it made him get interested in her.
- The Only One Allowed to Defeat You: Sorry, Roberto, but the privilege of screwing with Bambina (and thus Hozuki and Kazuki by proxy) is Cicinho's alone.
- Terms of Endangerment: Dubs Hazuki "Bambina" and flirts with her just to annoy her.
- Affectionate Nickname: Doesn't take long for "Bambina" to turn into this.
Anna Hendrix
Voiced by: Marina Inoue
- Ascended Fangirl: Very happy to go on a globetrotting adventure with the descendants of Galileo.
- Big Damn Heroes: She's the one to save Hazuki at the start of the series, and is in no small part responsible for the girls' escape.
- Double Agent: Is apparently working for Roberto.
- Love Martyr: She is willing to die for Roberto if necessary, but according to her, he couldn't care less.
- Otaku: She's a Galileo otaku.
Roberto Materazzi
Voiced by: Taiten Kusunoki
- "Death knows neither time nor place. It is fair and merciless to all, Cassini."
Heir to the Adonimoon Company and dead-set on locating Galileo's Inheritance at any cost, up to and including murder. He hates people who are uncivilized and weak. He thinks that the world is overpopulated and that the uncivilized are mere leeches upon society.
- Big Bad: He’s out to get Galileo’s Inheritance and is the Galieli sisters’ main enemy.
- Character Tic: Making origami.
- Dark and Troubled Past: Originally, he came from a wealthy family who taught him the importance of selflessness. Then a disaster that he barely survived killed his parents.
- Expy: Of Phoenix Wright.
- Freudian Excuse: His hatred of those he feels are drains upon society (read: pretty much anyone who isn't prim and exceptional) comes from how the homeless people his family fed chose not to help him when his parents were killed in a disaster, and instead chose to steal from his mother's corpse and ignore him when he was nearly crushed by debris.
- Start of Darkness: The deaths of his parents, along with the callous disregard the homeless people they had previously feed gave to the situation.
- The Stoic: Calm, collected, and almost unflappable.
- Would Hit a Girl: Is willing to threaten the lives of both the girls and Maria, his Double Agent, just to get the inheritance.
- Would Hurt a Child: Sometimes, the situation calls for the murder of a child or two.
Galileo Galilei
spoiler:Voiced by: Yūki Kaji
Yes, the real one. Hozuki travels to the past, falling on his aircraft. He's currently studying a strange phenomena on the sky. He has no idea Hozuki's his descendant.
- Intelligence Equals Isolation: Truth in Television. The real Galileo Galilei was tried and put into house arrest for his groundbreaking theories. He tells Hozuki about how alienated he got by everyone, to the point he didn't even want to discuss his dreams with anyone until she arrived.
