You are not talking about Akiyama right? RIGHT?
Please tell me you are not comparing Akiyama to Snow... please...
And to your first question, yes there is one side quest that we see more of her in it if I'm not mistaken. I don't remember how you get it though.
Definitely not. Akiyama as a character is great. I found his kicks only fighting style a bit tedious. It never quite clicked, but even with fighting being not as fun as the others he's probably my favourite MC so far.
Shinada however can go hang out somewhere where all other horrible video game characters go.
Edit: if Akiyama was a FF character he'd be a Balthier (FFXII) or Edgar (FFVI). He's just so effortlessly cool.