Amity dyes her hair green. This visually signifies her conformity to the Blight family, changing herself to imitate Emira and Edric’s green hair.Amity’s lighter green is symbolic of her as a pale imitation of them, like her wanting to top their exam scores in Adventures in the Elements Amity doesn’t dye her roots. This is an interesting detail to add to her character design because it highlights the construction of Amity’s visual façade in parallel with her social façade with her ‘friends’ at Hexside. When we see past-Amity in Willow’s memories, she has her natural brown hair. So, Amity not dyeing her roots – giving her that little splash of natural colour - symbolises how beneath the façade and pressure to conform, she's still herself. Willow’s childhood best friend is still in there, under the Blight Persona. Butonly the top of Amity’s hair is a darker green like her siblings. Underneath, her hair is turquoise-green like Azura. So, Amity’s hair has 3 layers. The Azura association is sweet and kinda tragic: After pushing Willow away Amity couldn’t be her dorky, nerdy self with her new ‘friends’, so she curled herself around the comfort of the Azura books and dyed her hair that colour as a silent ode to her childhood hero. This suggests that Azura inspires Amity just as much as she does Luz. I can just imagine little Amity dreaming about Quests and Destinies like Luz does in Witches Before Wizards, before having her dreams cut down to size and remoulded to the whims of her parents. Amity at the beginning of the show represents the person Luz could’ve become if she’d gone on the Reality Check Summer Camp. Her hair symbolises the triple-influences of the Blights (dark green - her siblings), Azura (and through Azura, her emerging friendship/crush on Luz) and her former friendship with Willow (brown roots)The influence of the Blights, Willow, and The Good Witch Azura
See Also
Edric Blight