Why Does Kakashi Hatake Cover His Face?

Why does Kakashi Hatake wear a mask?

In an interview with the creator of Naruto, Kishimoto Masashi said that he designed Hatake Kakashi wearing a face mask to go along with the mysterious theme that ninjas have. He was planning to introduce even more characters with masks but found it challenging to convey their emotions. That’s why Kishimoto finally let go of his plan and drew characters with actual faces.