(posting again because answering to the previous question was so much fun :D)
How does Costello's job as a maffia boss affect their relationship? I.e. does she approve of it, does she even know, does it create any tensions or awkwardness between the two?
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The downside of this thread is that I doubt anyone's actually reading the replies. XD Another interesting question though!
It's not a matter of betrayal, but rather - indeed - Sanya's initial hate for Nea's father and his mission. Sanya and Nea had, in many ways, opposing political views and moral differences. Sanya's a rather pascifistic supporter of Central Government, whilst Nea idolizes her father Anchari Maleios, whom the majority sees as an anti-Central radical and warmonger (or a liberator and enlightened ideologist fighting an oppressive regime, if you believe his followers). Sanya had been responsible for talking the rest of the party into breaking Nea out when she was unfairly apprehended by the police and as such felt responsibility both for her wellbeing...as well as her future actions. Sanya had occasional internal battles along the lines of "If she goes on to use her seer-powers to join her father and wage a war against Central Government, would all those lives be on my concience for having helped her? Should I treat her like a criminal for her views, though she's never hurt a fly and has very understandable motives for her beliefs?".
The two mended some of their differences by the end of the campaign, with Nea starting to question whether Central Government are the "bad guys" (largely thanks to Sanya not treating her like a ticking time bomb and the two being comfortable having philosophical arguments with one-another) and Sanya growing to empathize with her people and her fathers' teachings (though not his methods).
When it comes to the crush itself...Sanya found Nea to be insanely attractive as well as cute, graceful, brave, selfless, headstrong, fascinating in her similarities and stark differences...plus Sanya probably got some satisfaction out of getting to be her "knight in shining armor". Often it wasn't the deepest nor the healthiest relationship, but it had a bright-burning star-crossed earnestness about it. :D