I would say Natalcya is Lawful Evil. Definitely Lawful, to the point of insisting that reality in some respects is defined by human law (she'll argue that she is human because the law says so, for example). Evil because, even though she's not without compassion, she won't think twice about working the law to further her own ends, and because she holds some pretty twisted attitudes and has done more than her share of shitty stuff for utterly petty reasons, over the years.
I see Ruby as Neutral Good. She wants everybody to be happy. Everybody. Forever.
Other characters, filtered partly through Katla's eyes, partly through OOC impressions:
Anslo: Chaotic Neutral. Moody, unpredictable, apparently prone to violence at the drop of a hat, no clear loyalties to anybody except for his personal friends, but doesn't come off as malicious.
Makkal: True Neutral. Comes off as a highly talented social chameleon, seemingly able to find common ground with most people she seems curious about, the number of which seems high. Though she is a Khanid noble, she seems perfectly at ease in a number of very different social situations and company.
Pieter: Lawful Good with tendencies toward Neutral Good. Apparently attacked authority representatives at one point when he was ordered to fire on civilians?
Silas: Lawful Evil. Although she can seem impulsive and capricious at times, it is probably not out of disdain for law as a concept, but rather from a belief that the law begins with her.
Steffaine: Neutral Good. Her altruistic bent seems clear enough. Adhering to a knightly codex would be lawful in itself, but this is counteracted by the seeming fact of her conjuring it out of thin air.
Merdaneth: Lawful Neutral, fairly typical Amarrian loyalist as far as Katla is aware.
Katrina: Lawful Neutral. Seems too petty (and sometimes verbally abusive) to be good. Although her often informal and flippant attitude might suggest a chaotic influence, her loyalty and dedication to her faction, alliance and corp seems thoroughly genuine.
Saede: True Neutral. Comes off as a scientist first and foremost, passionate about her field of study, fond of professional debate, but perhaps a bit socially detached, and not overly concerned with laws or for that matter ethics. Very utilitarian in outlook.
Aria: True Neutral. Another very rational-minded character. Philosopher who cares about societal ethics to the point of obsession, and yet seems highly detached from them in her own personal life. Analytical and insightful, and perhaps so preoccupied with self-analysis that she forgets to simply be herself. Aria is probably the kind of person who'd be liable to connect the vision centers of her brain to a camera drone following her, and live her life in third person.
Aldrith: Lawful Evil, judging only by hearsay and limited personal interaction. Comes across as a fire-and-brimstone avenger kind of person, with a reputation for killing people (and himself) up close in nasty ways, and display their body parts as trophies.
Silver Night: Lawful Good. A true altruist with dreams of a society where everyone can live together in peace. Withdrew from the Nation camp because of regrettable but understandable conscientuous objections.
Seriphyn: Lawful Good. Can come off as vain, but seems to be genuinely interested in making his sandbox nation a peaceful, orderly and prosperous place.
Diana Kim: Lawful Evil. Racist, aggressive and completely loyal to her master.
Samira: Lawful Neutral. Obedient and meek toward her superiors, and judgmental of those she'd naturally perceive as standing outside of the hierarchy she belongs to.
Gwen: Lawful Good. Generally good-natured, and highly self-conscious about her own behavior in regard to the expectations of everybody around her, and those of her native culture.