I want to maximize believability
I'll address a few sticky points.
Kiam Arreiz displays characteristics of both the Gallentean and Caldari cultures, as a result of being born on a Quafe-controlled gas giant in Lonetrek. She is ambitious, outgoing and compassionate, but often composes herself into a no-nonsense and professional disposition that is expected of a Caldari when the situation demands it.
Awesome. A genuine hybrid of stereotypes and thus something that approaches a living, breathing, believable character.
Being a tube child (one of the few born under the Quafe Corporation), she has an innate loyalty to the Caldari State, but only to the notion of it being her home and place of birth. She does not exhibit the jingoistic and/or xenophobic loyalty of other State citizens.
Quafe made tube children? I know they can be a nefarious company under the surface (Quafe Plus, etc.), but imo this doesn't fit their MO. The tube child programs were patriotic measures intended to increase the State's population and make it stronger by rapidly infusing it with new people. Many were raised in what we would probably consider brutal emotional conditions and were effectively corporate investments not very different in treatment from livestock. They were expected to perform and give all for the State. After all, it was why they were born, and those who couldn't hack it as the
ubermensch the megas wanted are probably now scrubbing the scum off the bottom of the State if they're not dead or running with criminals.
Why would Quafe make tube children? Maybe there's an interesting story to explain why, but I think it would be more dramatically valuable as something that is tucked away rather than broadcast as a defining factor of her life and personality. People are going to ask you the same question IC: "Quafe made tube children?" If you can't answer with solid proof, you're playing very heavy handed with PF and common IC knowledge and risk being ignored or breaking immersion for many people.
That question aside, I don't think a sense of belonging, such as you describe her feeling toward the State, is necessarily a consequence of being lab-grown. Many people, perhaps most, feel sentimental attachment to their childhood home or place of origin, even those who don't come from hypercapitalistic semi-police states.
The idea is to create a "Gallenteanized" Caldari who still considers herself a loyal State citizen.
I don't think those two ideas mesh very well at all. Loyal
State citizens are the militant, jingoistic, and racially-conscious types who support a centralized and powerful Caldari nation. People who consider themselves citizens of a particular megacorp
within the State before they think of themselves as citizens
of the State itself may be more inclined to liberalization. She may be loyal to her culture, her corporation, or to the socioeconomic ideals that prevail in the State (an idealistic version of the 'meritocracy' perhaps), but she isn't loyal to Heth's vision or to the idea of a State-as-Bastion against Gallentean evils. I say this in a definite sense because this theme of loyalty so strongly contrasts with her FDU service and in-game standings. She has taken part in operations that the State obviously considers bad, even if she's never shot down a STPRO vessel. By most Provist and patriotic mega accounts, I think she's likely to be considered
gurista if not something much worse.
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I think the takeaway here comes back around to a question that was asked on Backstage several weeks ago: how much of your character exists without her faction affiliations? If you focus on characterizing her in and of herself,
demonstrate her traits through words and choices rather than
describe them, and bring her to life as an individual with every human quality and doubt rather than an impersonal face caught between various great forces and factions, you'll achieve the believability you want.