If you're a fan of mystery anime and haven't watched "The Melancholy of Haruhi Suzumiya" yet, then you're truly missing out. This iconic series follows the story of Kyon, a high school student who gets caught up in the eccentric and supernatural world of Haruhi Suzumiya, a blue-haired girl with god-like powers. With her vibrant blue hair and unique personality, Haruhi is a character that stands out in the anime world. In this series, Haruhi and her club members embark on various mysterious adventures, from investigating supernatural phenomena to solving the mystery of a time loop. With a touch of comedy and a splash of sci-fi, "The Melancholy of Haruhi Suzumiya" is a must-watch for anyone who loves mystery and a hint of the supernatural.1. "The Melancholy of Haruhi Suzumiya"
Next on our list is "Hyouka," a mystery anime that follows the story of high school student Oreki Houtarou, who is forced to join his school's Classic Literature Club by his older sister. There, he meets Chitanda Eru, a curious and energetic blue-haired girl who quickly becomes the focus of his attention. With Chitanda's insatiable curiosity and Houtarou's deductive skills, the two of them often find themselves caught up in various mysteries surrounding their school and their town. "Hyouka" is a slow-paced and contemplative series that will keep you on the edge of your seat as each mystery unravels.2. "Hyouka"
If you're a fan of horror and mystery, then "Another" is the perfect anime for you. This series follows the story of Sakakibara Kouichi, a transfer student who finds himself in the midst of a deadly curse that has plagued his class for 26 years. Along with his classmate, the mysterious and blue-haired Misaki Mei, Kouichi must uncover the truth behind the curse before it's too late. With its eerie atmosphere and chilling plot, "Another" will keep you guessing until the very end. Mei's blue hair adds to the mystery surrounding her character, making her a standout in this already suspenseful anime.3. "Another"
In "Kamisama no Memochou," also known as "Heaven's Memo Pad," we follow the story of Narumi Fujishima, a high school student who gets pulled into the world of NEET (Not in Education, Employment, or Training) detectives by the blue-haired Alice, a NEET detective herself. Together, they solve mysteries and crimes in their town while trying to uncover the truth behind Alice's past. Alice's intelligence and sharp wit, paired with her signature blue hair, make her a lovable and intriguing character in this mystery anime. "Kamisama no Memochou" is a unique and gripping series that will keep you hooked until the very end.4. "Kamisama no Memochou"
While "Kiznaiver" may not be a traditional mystery anime, it still features a blue-haired girl who adds a touch of intrigue to the story. This series takes place in a futuristic world where a group of high school students is chosen to participate in an experiment that links their pain and emotions. The blue-haired girl in question is Sonozaki Noriko, the enigmatic and mysterious leader of the experiment. As the group of students navigates their newfound connections and the secrets behind the experiment, Noriko's character becomes more and more intriguing, making her a standout in this unique and thought-provoking anime.5. "Kiznaiver"
Another anime that features a blue-haired girl with supernatural abilities is "Kokoro Connect." This series follows five high school students who suddenly find themselves swapping bodies and experiencing each other's emotions due to a supernatural phenomenon. The blue-haired girl, Nagase Iori, is the leader of the group and often takes charge in solving the mysteries behind their body-swapping. With her calm and collected demeanor, Iori adds a level of mystery and intrigue to this heartwarming and comedic series.6. "Kokoro Connect"
In "Kakegurui," we follow the story of Yumeko Jabami, a transfer student at the prestigious Hyakkaou Private Academy, where students are ranked based on their gambling skills. With her striking blue hair and love for high-stakes gambling, Yumeko quickly becomes a target for the school's top gamblers. As Yumeko navigates the twisted world of gambling at Hyakkaou, her blue hair serves as a symbol of her rebellious and unpredictable nature. With each high-stakes game, Yumeko's character becomes more and more mysterious, making "Kakegurui" an addictive and thrilling watch.7. "Kakegurui"
Set in the bustling city of Ikebukuro, "Durarara!!" follows the intertwining stories of various characters, including the blue-haired Celty Sturluson, who is known as the "Black Rider." Celty is a Dullahan, a headless supernatural being, who is searching for her missing head in the city. With her iconic blue helmet and mysterious backstory, Celty becomes a fan-favorite in this action-packed and unpredictable series. Her character adds a touch of the supernatural to the already mysterious and chaotic world of "Durarara!!"8. "Durarara!!"
In "Bungou Stray Dogs," we are introduced to a world where individuals possess supernatural abilities based on famous literary figures. One of these individuals is Nakajima Atsushi, a blue-haired orphan who joins the Armed Detective Agency, an organization that handles supernatural cases. Atsushi's character is initially shrouded in mystery, but as the story progresses, we learn more about his past and his connection to the Armed Detective Agency. With his bright blue hair and his unique ability, Atsushi is a standout character in this action-packed and mysterious anime.9. "Bungou Stray Dogs"
Lastly, we have "Kuroshitsuji," a mystery anime set in Victorian-era England. The series follows the story of Ciel Phantomhive, a young earl who has made a contract with a demon to seek revenge on those who wronged him. The blue-haired girl in this series is none other than the demon, Sebastian Michaelis, who serves as Ciel's butler and protector. With his sharp wit and supernatural abilities, Sebastian adds a touch of mystery and intrigue to this dark and thrilling anime.10. "Kuroshitsuji (Black Butler)"