What could be the reasons for Harry to dye his hair in fanfiction?

Maybe he wants to rebel against his family's traditional image. In the wizarding world, the Malfoy family has a certain 'pure - blood' and proper image. Dyeing his hair could be a way for Draco to show his individuality and break free from the constraints his family has put on him.

In fanfiction, it could be related to a magical accident. Maybe a spell went wrong and changed the color of his hair, and then he decided to keep it and even dye it a different color on purpose. It could also be a part of a transformation arc, where changing his appearance, starting with his hair, is a symbol of his growth and change as a character.

One reason could be for a disguise. Maybe she's on the run from some bad guys in the fanfiction world and changing her hair color helps her blend in better.

He could dye it black to look more mysterious, like a dark wizard in disguise. Or perhaps he'd go for a bright red, which would make him stand out more and show his boldness. Another option could be a platinum blond, giving him a completely different look, maybe to imitate a famous wizard from history.

Maybe it's a magical protection. In the wizarding world, there could be some ancient magic associated with hair length. Long hair might act as a sort of shield or a connection to some deeper magic that Harry unknowingly benefits from.

Green hair dye was a trendy hair color choice. There were many different green hair colors to choose from, such as mint green, peacock green, matcha green, dark green, and so on. These green hair colors could show different styles and personalities, from the noble and pure emerald green to the fashionable peacock green, which could bring different visual effects. In addition, green hair dye could also be chosen according to one's skin color and preferences, such as low-key and gentle green tea, avocado green, grass green, and so on. For boys, dyeing their hair green could show their personality and fashion sense. In general, green hair dye was a popular hair color choice. You could choose a green hair color that suited your personal preference and style.

Fei Xiang's hair was not dyed black. His hair was black. Fei Xiang was of mixed Chinese and American descent. He had inherited his father's tall and handsome figure and his mother's black hair. His black hair made him look handsome and young.

Perhaps in the fanfic, Naruto is trying to fit into a different group or culture. His original hair style might make him stand out in a negative way in that context, so he changes it to be more accepted. Or it could be part of a bet or a challenge. For instance, he loses a bet with his friends and as a consequence, he has to change his hair style.

The five whitest colors were smoky blue, dark brown, milk tea, and rose gold. These colors were very good at decorating the skin tone, making the skin look fairer. According to personal preference and skin color, you can choose a color that suits you.

The step-by-step tutorial for dyeing hair could be found according to the search results provided. First, he needed to go through the steps of fading his hair. He could apply a mixture of bleacher powder and dioxygen milk on his hair and wait for about an hour to let his hair fade slowly. Next, apply the hair dye cream of your favorite color evenly on your hair and wait for about an hour (the time for the light color hair dye cream can be slightly shorter). If you want to dye your eyebrows, you can also apply hair dye cream gently. Then, he washed his hair and observed the color after washing his hair. If he found that some parts were not uniform, he could use colored wax to dye them. Before applying the colored wax, you can first apply Vaseline to the edge of the hairline to prevent it from staining the skin. Lastly, the color of the hair might differ depending on the lighting indoors and outdoors. It should be noted that the specific steps of each hair dye may be somewhat different. It is best to refer to the instructions of the hair dye.