Fairy Tail fans know Lucy Heartfilia as the blonde-haired celestial wizard and one of the main protagonists of the series. However, in one of the arcs, she temporarily dyed her hair blue as a disguise. But even with blue hair, Lucy still remains the lovable and kind-hearted character that fans have come to adore.1. Lucy Heartfilia
Hinata Hyuga from Naruto is known for her shy and timid personality, but her blue hair is a representation of her inner strength and determination. As a member of the Hyuga clan, her blue hair is a symbol of her noble and powerful lineage. And as she grows and becomes more confident in herself, her hair also becomes a deeper shade of blue.2. Hinata Hyuga
As one of the most popular vocaloids, Miku Hatsune is recognized for her iconic turquoise hair and blue eyes. Her appearance is inspired by the color of the VOCALOID software, and her hair is often styled in twin tails or loose pigtails. Miku's blue hair is a reflection of her energetic and bubbly personality, making her a fan favorite.3. Miku Hatsune
In the world of Bleach, Rukia Kuchiki stands out with her short, indigo hair and striking blue eyes. As a soul reaper, she is known for her calm and composed demeanor, but her blue hair also represents her determination and fierce fighting spirit. Rukia's hair also changes color when she uses her powers, which adds to her cool and powerful image.4. Rukia Kuchiki
Yuno Gasai from Mirai Nikki is a character with a complex and twisted personality, but her bright blue hair is often seen as a symbol of her innocence and purity. As the yandere love interest of the main character, Yuno's hair adds to her mysterious and alluring aura. And as the series progresses, her hair changes color to reflect her ever-changing emotions.5. Yuno Gasai
In the world of Sailor Moon, each of the Sailor Scouts has a unique hair color that represents their inner power. Sailor Mercury, also known as Ami Mizuno, has long, blue hair that matches her water-based abilities and intelligence. Her hair also symbolizes her calm and level-headed personality, making her a valuable member of the team.6. Sailor Mercury
Nami is the navigator of the Straw Hat Pirates in One Piece and is known for her fiery personality and love for money. Her signature blue hair is a reflection of her adventurous spirit and adds to her unique and playful appearance. Nami's hair also changes color depending on the arc, showcasing her growth and development as a character.7. Nami
Asuna Yuuki, also known as Asuna from Sword Art Online, is a skilled swordswoman with long, chestnut hair that eventually turns blue in the game. Her hair color change is a representation of her transformation from a sheltered princess to a strong and independent fighter. Asuna's blue hair also serves as a symbol of her loyalty and determination to protect her loved ones.8. Asuna Yuuki
Sakura Haruno from Naruto is known for her iconic pink hair, but in the series' sequel, Naruto Shippuden, her hair turns blue after a time skip. As a trained medical ninja, Sakura's blue hair is a nod to her healing abilities and her growth as a character. Her hair also becomes a deeper shade of blue as she gains more control over her chakra.9. Sakura Haruno
Erza Scarlet from Fairy Tail is a powerful and respected member of the guild, known for her strict and no-nonsense personality. Her long, scarlet hair is her trademark, but in one of the arcs, she temporarily changes it to blue to hide her identity. Even with blue hair, Erza remains a formidable and fierce character, showcasing her adaptability and resourcefulness.10. Erza Scarlet