1. Kakashi's Eye Cover: Kakashi wears an eye cover because his Sharingan consumes his chakra. By covering it, he can conserve chakra.

2. Might Guy's Belt: Might Guy and his student Rock Lee both wear headbands as belts. This could be a fashion choice to add decoration to their outfits.

3. Sakura's Hairpin: Sakura uses the headband as a hairpin to hold her long hair in place.

4. Shikamaru's Arm Band: Shikamaru uses the headband as an armband, wearing it on his sleeve.

5. Hinata's Necklace: Hinata wears the headband like a necklace to avoid covering her forehead, as it would hide her hair and the leaf symbol.