Anon in my opinion yuji overall is same as his teenager self except less childish nd mature just like what happens usually with teenager. He is willing to take risks ,is practical nd is easily approachable as in personality wise. Like I believe he was easy going even when he was a teacher..

Oh he has strong opinions his talk with maru made me realize that yuji is very opinionated. I would say he tries to understand things from others perspective but ultimately does what he deems right. But takes full reesponsibility of his actions. Cuz yuji knows that things might go wrong nd somebody should be accountable for it..
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Now I think his slow aging affected him on a large scale . Like him isolating himself more nd more, avoiding meeting his friends nd colleagues as much as possible cuz seeing their faces made it difficult for him to not think of his future where he was alone. To avoid being alone with his thoughts he goes pachinkos nd on different places where other people can't recognize him.. I would say his slow aging was preventing him from living as itadori yuji nd that's why he wanted to erase that identity hoping that would make things easy for him.

But the thing is that's all gonna change not everything ofc.. I think yuji will just keep eye on stuff that's happening but will guide others to deal with them under his watch. I know he's going to drill it in next generations 's the fighting spirit enough to last next 2-3 generations. He'll be the one shaping a system where he'll be considered a super last resort wheras yuji will keep suppressing this one part where he still curses sukuna for not accepting his offers. He wants to do this with choso too but he can't cuz he does not want to disrespect his brother's memories so he ends up cursing sukuna on choso's behalf too since sukuna is the reason he's dead..

Sorry I don't know if that's what you wanted to know but that's how I truly feel nd I feel it's from now on we'll see true yuji itadori..

Nothing.. I have never worried that much abt yuji getting together with someone else maybe cuz jjk is a shonen. So I'll accept whatever gege decided to do. It applies even now. However I would suggest you to stop worrying abt itfs. Just cuz itfs likes to yap abt itfs all day it doesn't mean that'll make their ship canon. In fact it should be them worried , wondering if gege decided to make hanagumi canon. Also only they buy their headcanons. Every body knows that moment belonged to kugisaki nd not megumi.. The most I have been worried abt is gege giving them moment more important than yorube which even you know isn't gonna happen.. Also itkg moments in modulo has made it as important as itfs whether someone believes or not..