When I read about Yuuya's character, I feel that I prefer Yuuken more than him. He's just too soft to be a therapist in a school full of problematic students, who can simply beat him down. Unless they gave him a character development where he slowly starts to become more stronger and confident of himself. I don't hate sensitive type of men, but Yuuya doesn't seem to fit right in Twst to me. Yuu is like a mix of Yuuken and Yuuya, that is seems like they got split into 2 separate personalities.
I'm seeing these kinds of opinions floating around, everyone has their preferences, that's just fine! I understand that to some Yuuya might even seem like the typical Isekai MC, but it doesn't have to be like that. It's not like his life has improved being brought into the Twisted Wonderland lol, having to play impromptu therapist for all kinds of troubled younguns being one himself; which, ironically, is the kind of character that would fit right into this story.
In my personal opinion, it's interesting to see a new take on the story with this Yuu that was less than prepared for such a big change. This is less a Yuu that can guide the cast like Yuuken, and a less neutral Yuu than his game counterpart; Yuuya is another troubled youth that can develop alongside the others in this school, without losing his kindness and soft demeanor. Kindness does have a place in NRC after all, we have seen it in the likes of Kalim, Jack and Deuce.
And, yeah, everyone at the school is so powerful they could beat Yuuya senseless, but it's not like they will, it's kind of funny to me you imply that. It would be out of character for practically the entirety of the main cast to do so unprovoked or because someone is trying to be kind to them. At most, they will insult you and keep walking, even if not out of an obligation to a friendly relation or any moral code at first, they will do so simply because they don't consider it worth their time and effort to play around with someone that's so weak. Not even Leona would do it if you stepped on his tail. The guys are also not stupid; they know that if something happens to Yuu, Crowley will have their asses since, again, Yuu in any iteration is a special case and it is still Crowley's responsibility, and it will still look awful if a human gets severely injured in college grounds.
Being kind and soft is not necessarily a weakness, either, even if it would be nice if Yuuya developed to be more confident (and I heard he is? As I mentioned earlier, it's interesting that now we get an MC that needs to sort an extreme amount of baggage just like his newfound peers). Strength, he will gain it, I'm sure of it, but strength can be many things. If you mean physical or magical strength, that's not entirely necessary. Emotional and mental strength, or stability more like, that he could do with.