why does kakashi hatake wear a mask

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

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

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.

Kakashi may become more fatherly. He starts to show more emotions and care, different from his usually aloof self in the original series.

Maybe the kid is trying to be spooky and create a mysterious atmosphere. Wearing the mask adds to the creepy effect.

In some fanfics, it's to add an air of mystery and make him seem more enigmatic.

Well, they are an interesting pairing because of their age difference and different experiences. Kakashi is much older and has a lot of battle experience and a tragic past. Sakura, on the other hand, is a young and ambitious kunoichi. The contrast between their maturity levels and life stories can create a lot of interesting dynamics in fanfiction. For example, Kakashi can be a mentor figure to Sakura in some stories, which then can develop into something more romantic as Sakura grows and matures.

One great Kakashi Hatake fanfiction is 'A Shinobi's Redemption'. It delves into Kakashi's past traumas and how he overcomes them in a very emotional way. The story has well - written fight scenes and great character development.