Alright, Esme is on hiatus now, so feel free to post, Midori.
Yuuki, the only problem I have with your character is that he's on a "pro" level. Right now, I'd rather have amateurs and low-level criminals as The Citizens are just barely coming together. Your character is what I would call a "tier 2" character, while the others who have joined were tier 1. However, there is a point in the story where we will suddenly need several more crew members. At such a point we will have already gained the kind of reputation that would attract individuals like Shin. I just don't see him being one of the original members though.