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Genuinely, it’s so easy to see Sigma being tired of such big behind the scenes roles, even if it’s for the Agency.
Especially because the Agency seems to already have their fill of administration and support members. (The structure of that place is kind of a mess but it works very effectively.)
It would be nice to see Sigma go through the journey of trying to put himself into a place like that, only to realize that’s not he wants, and it’s not where he fits.
Being a part of a family doesn’t mean you have to be a member of their group or organization. The best families are the ones who let you choose the path that is best for you.
So then he ends up at the cafe, and is able to build his own life and identity in that space for the first time ever.
I don't want Sigma to become a detective, purely because I don't think that's what he wants either.
He wants the love, trust and care of the Agency, he wants the same bond Dazai has with the others. He's craving a home, a family, and the Agency is the first place he's seen have that.
But he's also highly strung and nervous, he doesn't seem to like being in combative and dangerous situations. Which being a detective would place him in. He does however seem to genuinely enjoy interacting with people and providing services for people.
He loved the sky casino and whilst the sheer size of his customer base overwhelmed him, he genuinely cared about that place and making people happy.
I think, if he does join the Agency, he should join it on the administrative side. He'd get to show off his organizational skills and he'd be helping people whilst staying out of action. He has great memory so going through case files and doing the behind the scenes research to aid the detectives out on the field would suit him well. He could also attend meetings with Fukuzawa, who hates having to talk business and help with the Agency's connections.
Alternatively, if he doesn't join the Agency, I think it would be fun if he also got a job at the cafe.
Again, I think he just enjoys customer service type roles and the owner has already adopted one stray in Lucy, why not another? Sigma and Lucy would be such a fun combo, I'd love to see them interacting with the Agency whenever they're in the cafe.