Shinji has really grown on me since the start of the season. I thought he was just too reserved at first, but as the show goes on, I've noticed it's to the benefit of the show. I think it's essential to have at least one person in the house who isn't a schizo, asshole, schemer, or all of the above.
He participates well in the challenges and he doesn't stir shit or aggravate the other fish. When he does, it's because production is prodding him. Even then, he's never mean-spirited in the antics he gets up to, so he never really draws the ire of the other fish. Production and the other fish seem to get along with him well, and I can guarantee you he's not going to flip the fuck out and attack a small woman. I particularly enjoy his late night talks to the cameras, and him looting everyone's shit was peak comedy.
He's got the spirit of a 50 year old Japanese salaryman and good manners, and that just appeals to me. Unless we get some shocker news about some taboo degeneracy he gets up to, I think he'll be fine. All his dirty laundry is already out on the table, and nobody can really rattle him with it. And honestly, nobody really wants to fuck with him. Why fuck with the guy who lets you have consistent peace in a hellhouse or causes the least issues for your production team?
When I heard him say he "already misses being here", I kinda feel sad for him. He clearly enjoys the socialization, and it makes me wonder if he spends his time secluded at home. He seems like an alright guy with some wild campfire stories.