• GACKT wrote music titles for Hokuto no Ken movies: the OP (opening title) is Lu:Na e la ED (ending titles) is OASIS. Longing e REDEMPTION have been used as the soundtrack for the game Final Fantasy VII Dirge of Cerberus.
• His image and physiognomy have been used to reproduce virtual characters such as Squall from Final Fantasy VIII, Cloud from Final Fantasy VII and Genesis.
• In his autobiography, GACKT tells that he had a near-death experience as a kid almost drowning in the sea and this made him very sensitive to the spirit world.
• GACKT confirmed his birth year only in 2004. For years before that, he said he was born in 1540.
• GACKT has an older sister and a younger brother.
• His favourite actors are Sandra Bullock, Meg Ryan, John Travolta and Nicholas Cage.
• His ideal woman is Jessica Alba.
• his favourite movies are Léon, City of Angels, Braveheart, Phenomenon, Nuovo Cinema Paradiso and The Postman.
• In the Saikai Story video clip, there’s a sequence of kisses clearly inspired by the move Nuovo Cinema Paradiso, one of his favourites.
• His staff has nicknamed him 魔王さま (maou-sama), that literally means “King Demon” since he’s very strict and demanding and he wants everyone to work really hard.
• His favourite colours are black and white.
• GACKT is ambidextrous.
• GACKT as a huge coloured lens collection, but as for all Japanese people, his true eye color is black as you can see from the Fūrin Kazan drama.
• His house has a dojo, a bar and a waterfall inside the bedroom.
• GACKT used to smoke a lot but he stopped in 2006.
• He loves spicy food like kimchee and curry.
• He has a personal chef, Izumi.
• He prefers sunset to any other moment of the day.
• He prefers candlelight rather than artificial light.
• He can’t stand summer, it’s the season he likes less.
• He can’t stand the heat, even if he likes hot meals because it shows the dedication of who made them.
• He hates being disturbed while eating. He doesn’t like it because he wants to enjoy his meal slowly.
• GACKT is a close friend of some famous people in Japan: Hyde ( L’Arc En Ciel and Vamps), Yoshiki (leader X Japan), Sugizo (Luna Sea), Hamada Heyx3, Music Champ, Downtown host), Black Mayonnaise (comic duo), Masahiro Inoue (Kamen Raider actor), Miyavi, Ayumi Hamasaki and many others.
• GACKT is used to say that Miavy is like a brother for him and Miavy is used to call him “Gaku-ani” or “onii-chan” (both meaning Big Brother).
• GACKT can say that some younger singers are his big fans, for example, Ueda Tatsuya from Kat-tun and Shō Kiryūin from Golden Bomber and also Kamijo from Lareine and from Versailles.
• He really loves and adores Hyde, Arc~En~Ciel and Vamps vocalist. GACKT declared: “Let’s talk about Hyde, for example. When I’m with him I always think “This guy is amazing” this is love too… or it’s really close to it. His smile it’s a waste […] If he was a girl, I’d probably fell in love with him: I like guys like this […] If there’s a girl as kind as Hyde I’d probably fall in love with her.
• He said he got moved the first time he listened to Stairway to Heaven from Led Zeppelin.
• GACKT revealed that Jesus is a tribute to Metallica. It is actually possible to recognize a tribute to One.
• GACKT was really close with Ogata Ken, he acted alongside with him in the drama Fūrin Kazan. He was like a teacher and a father figure for him.
• Ever year GACKT visits Kami’s grave (Malice Mizer’s drummer) on the day of his birthday and his death.
• The music you can hear while waiting for his concert to start is Ravel’s Bolero.
• He loves the most Chopin a Bach among all the composers.
• To keep his shape, GACKT has removed carbohydrates from his diet. This is why it has been over 10 years since he ate rice.
• He usually sleeps 2-3 hours per night. He spends the rest of his time training or working.
• GACKT has gifted to his family and friends onyx bracelet as a symbol of protection.
• His alarm clock always rings at 5 am, when training starts.
• He drinks vegetable juice for breakfast every day.
• GACKT trains with his band and dancers 5 hours a day.
• GACKT knows different martial arts, Karate and Tae kwon do are among them.
• His favourite city is Paris, followed by New York.
• GACKT is such a Gundam fan that he can act dialogues by heart. Sometimes during TV shows, he’s asked to perform impressions of the characters. He also dedicated an entire album to the series singing all the opening titles.
• GACKT always tries to read and reply to the emails fans send him, he often replies to them on Twitter and he updates frequently his blog.
• Every year he held a trip with his fans where he performs a live concert just for the fan club. The destination changes every year.
• GACKT also organizes a trip on the snow with his fans every year.
• He created an imaginary school, the Camui Gakuen, where he is the school President. In the lives and events related to this concept, the audience has to wear a school uniform. GACKT pretends to be a singer of a cover band and often sings covers from other artists.
• His favourite manga is Banana Fish.
• He hates roaches but he said he’d love to be born again as a roach just to understand them better.
• He loves to dismantle objects just to understand how they work. He dismantled his piano and his parents’ car when he was a kid.
• During an interview on Utaban, he declared to possess a “Magnum”. Nicknames and jokes are still alive today.
• He loves to stay completely naked both in his house or hotel room.
• He always wears sunglasses, also when he’s in TV shows. He only takes them off when he’s on stage.
• The director Luc Besson was so impressed by GACKT and his voice (GACKT congratulated him in French) That he asked him to be the voice of Maltazard in the movie Arthur and the Invisibles.
• GACKT is also an actor but only chooses roles where he can express himself. Among the characters that he plays, we can find Uesugi Kenshin,  Jo Teigai, Takegami Teijiro and Shiki Takashi.
• GACKT can ride horses. He opened his concert at Tokyo Dome riding a horse. After seeing his ability the director of the drama Fūrin Kazan gave him the role as Uesugi Kenshin.
• He has been voted in 2005 “Sexiest male singer” from Oricon Magazine.
• He worked as a model for his favourite designer Yoshiyuki Konishi.
• He lent his face for the “Metal Gear Solid 2: Sons of Liberty” promo ads and he has been gifted with his name on a plate that soldiers in the game could conquer.
• GACKT dedicated several songs to some of his friends that passed away. These are all happy song that wants to remember their lives and joys instead of their deaths. For example:
  My Father’s day dedicated to Ogata Ken.
  U+K dedicated to Kami, Malice Mizer drummer.
• GACKT wrote 12gatsu no love song for the events on 9/11 2001
• GACKT is used to shake hands with all the people that worked with him at the end of any activity to thank them.
• He’s an excellent snowboarder and he always has his snowboards with him everywhere he goes.
• GACKT publicly declared he owns a mountain to practice with the snowboard.
• GACKT sang SKET DANCE opening and give the voice to Dante, one of the character based on himself.
• Tsuki no Uta is the ending title of the anime Texhnolyze.
• As far as video games, other than Final Fantasy and Metal Gear Solid, GACKT also collaborated with Samurai Warriors 3 (where they use two of his songs, Sestugekka and Zan), Dragon Nest, where he gives is song Ever to the game, and gives the voice to the evil Belskard, modeled on him and also Bujingai, gamed based entirely on him.
• “Until the Last Day” is the soundtrack of the anime and game Dragon Age.
• GACKT has lent his voice to a character from the anime “Supernatural The Animation”, inspired by the famous American TV series of which GACKT is a fan.
• GACKT is the main character and narrator of the show Hero’s Hero where he tells the story of his three favourite historical figures: Masamune Date, Napoleone e Einstein.
• Gakupo is the first Vocaloid where the voice has been generated from a professional singer. His design has been created by Kentaro Miura, Berserk author.