Kakashu Hatake from Naruto anime also known as the copy ninja, loves wearing masks most people don't even see his real face. He wears a black mask all the time.
Ken kaneki
Ken Kaneki from Tokyo Ghoul is another popular character who wears a Mask when fighting. He is the main protagonist of this anime series. This is an action-packed anime with a good storyline and characters.
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Obito Uchiha
Ken Kaneki from Tokyo Ghoul is another popular character who wears a Mask when fighting. He is the main protagonist of this anime series. This is an action-packed anime with a good storyline and characters.
Image Credit:- IMDB
Hei
Hei is the main protagonist of Darker Than Black anime. He also uses a mask to hide his face and he's a leader of an organisation called Syndicate. This is an action-packed anime with a good storyline.
Image Credit:- IMDB
Lelouch
Lelouch from Code Geass is another popular character who also uses masks in war to hide his personality. He is a leader of an organisation which wants to destroy the Britannian Empire.
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Gin
Gin from Into the Forest of Fireflies Light is a mysterious character who wears a fox-inspired mask. This is one of the best anime movies you can watch if you don't have anything to watch.
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Lord Death
Lord Death is a popular character from Soul Eater who is a headmaster of Death Weapon Meister Academy and father to both Asura and Death the Kid.
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Killer
Killer is a member of the Kid Pirates from One Piece who wears a mask. He is listed as one of the Eleven Supernovas from the Worst Generation. One of the most dangerous men.