Ok just got up to date with this but one question, what is with him wearing his school uni...

I think it sorta became his royal clothes, too.

Remember when they made spare clothes to look like his school uniform? It's just because it suited him well, of course he doesn't always wear them though. Only when he should stand out. Like in the chapter where Conrad asked if he should wear it to intimidate the audience? And Yuri refused because he didn't want them thinking it was bad luck and blessing themselves? He isn't wearing the same set of clothes, its just a separate set that was tailored to look like them.

Oh yeah I guess but if I was him I wouldn't want to wear my school uniform for morecthen I had to

maybe he wears his uniform to remind himself of were he came from and of the people, family and the friends he has at the other world....I think..(●￣(ｴ)￣●)

let's just say him being the protagonist always wearing his school uniform in the other world is just the same as Rakan in Silver Diamond manga, also a shounen-ai
http://www.mangago.zone/read-manga/silver_diamond/