Who is this?

[Element Master]

Na, it's fake.

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If there was a translation then we could tell if this was real or fake, but i do not speak Japanese or know anyone that does

edit

according to reddit the text means

Spoiler

Movie is going to focus on the Hyuga/moon, This guy allegedly kidnaps Hanabi and Naruto,Sakura,Sai,Hinata, and Shikamaru are sent to rescue her.

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Sasuke confirmed non-villain, probably going to try and help.

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"During the situation with the moon crashing to earth, a situation occurs in Konoha where Hanabi is kidnapped! Naruto, Sakura, Shikamaru, Sai, and Hanabi are challenged to recapture Hanabi from the unknown mystery man!"

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[Ryóma]

That's not the Byakugan. I can see pupils.