Combat Pragmatist: Despite her personality, she can come up with some pretty brilliant strategies at times, such as using fishing techniques to take advantage in one fight against a Jovian ship, and utilizing air pressure to silently maneuver her ship in space without relying on engines.
Clingy Jealous Girl: A lot more so than Yurika, and that's saying something. It took awhile to set in, but once it did, it effectively murdered her chances of getting Akito's affection at all. She actually does gets the seeds of a serious relationship started, but she destroyed it all by trying to take things too far, which utterly repulsed him. Trying to get him to leave the crew of the Nadesico to their fate when they were in trouble didn't help either.
Heroic BSOD: A brief one in Episode 4, after the destruction of the space station.
Ace Pilot: When Ryoko gets in a funk during her limelight episode, Akito cheers her up saying that she's their best Aesti pilot. Might be a Downplayed Trope, though, since while Ryoko is a badass on the field of battle and she does tend to perform a bit better than her colleagues, she's typically not so far ahead of her comrades as to be set apart from them.
You Gotta Have Green Hair: However, it turns out it's dyed, evidenced both in the above mentioned flashback in the show and through the entirety of the movie, which shows she's entirely given up on dyeing it.
Her natural hair color is purple, so the trope still applies.
Berserk Button: He has two of these: 1) Seeing Akito 'get all the chicks', and 2) people breaking his Aestivalises.
Dirty Old Man: Played straight and subverted and played straight again. Part of the reason he came aboard was to get away from his wife and (theoretically) spread some wild oats. Later on, people think there's something going on between him and Hikaru. Then they find out that she's helping him build a diorama with 1/48 scale plastic Aestivalis models. Then Hikaru has to let him down easy when he does try to start a romantic relationship with her.
And then subverted again later in the series when he makes a heartfelt promise to his wife that he'll return to her once the fighting ends.
Where Does He Get All Those Wonderful Toys?: Justified; he makes most of the special gear used by the Nadesico by embezzling Nergal company funds, but they turn a blind eye to it as it means they get new equipment to use.
Ms. Exposition: She even has a sixth sense for when something is about to be explained.
Voiced by: Miyuki Ichijou (Japanese), Marcy Rae (English)
Crazy-Prepared: She has over 300 different spices in the ships pantry. Her reason: she wants to make sure each crew member gets to eat exactly what they want, because nobody knows if it might be their last meal.
Mentor: To Akito, at least where cooking is concerned.
Heroic BSOD- He was actually a much more moral, upright human being who believed in justice and doing the right thing, but he became corrupted by his own ambition, and after The Reveal on the identity of the Jovian Lizards, he snaps when his guilt over the bastard he became and his horror that what he fought for was a massive lie combine and drive him crazy.
We Have Reserves: When Minato points out that shooting the Nadesico's gravity blast will cause massive friendly casualties, his answer is pretty much "So what?"
Grey and Grey Morality: That's pretty much his view of the world - there are no good and evil, everyone should fight for himself only.
Jerk with a Heart of Gold (Believe it or not, he did make an honest stab at playing Big Brother Mentor to Akito [and it actually worked to some extent], and he does to some extent join in on the craziness of the Nadescio crew willingly.)