why does yuta wear white

Sure, Yuta is part of the Jujutsu Kaisen manga. He plays an important role in the story and has some significant moments and developments.

It's hard to give an exact time as it depends on the manga's plot development. But typically, Yuta Okkotsu shows up when certain events and character arcs lead to his introduction.

Maybe it's to hide his identity or for some sort of protection.

Maybe it's for protection from something, like dust or germs.

I'm not sure. Maybe it's part of the plot development or there's some hidden reason yet to be revealed.

Yes, Yuta does come back in the manga.

There was no clear answer to the question of why everyone was wearing 'Dream of the Red Chamber'.

Maybe it's for a unique style or to stand out. It could be part of the character's design.

Bane wears a mask to control the pain and enhance his strength. It's a key part of his character's identity.

Perhaps the mask is just a fashion choice or it might be related to a specific story or event in the BT21 storyline that gives a reason for Mang to wear it.