Hokusai Masaki is a 24-year-old male with light green hair and eyes, standing 193 cm tall with a slender build and pale skin. His blood type is AB, and his birthday is March 3. He works as a part-time high school student, attending classes from late afternoon to evening daily. At age 3, his father’s imprisonment for murder triggered social isolation. Severe bullying followed at 13 due to his father’s crimes. When his mother committed suicide at 14, he entered a children’s home. Unable to connect with humans, he turned to animals at 15, forming deep bonds with stray cats. These events forged his fear of loneliness and distrust of societal judgment. Homeless at 18, he was rescued by Iori Suiseki and joined Suiseki until its dissolution at 22 after turmoil. He then became an AKYR member. Physically, Hokusai displays symmetrical tiger tattoos from shoulders to below his elbows and piercings—six on his left ear, three on his right. His typical attire includes a black 3/4-sleeve turtleneck, a white hooded jacket with neon green stripes and red hardware, black track pants with red stripes, and black-and-green sneakers. For Exhibition Shows, he wears light green coveralls with deep orange accents, slipped off one shoulder to reveal tattoos. He accessorizes with fingerless gloves, gold necklaces, and rings, including a gold diamond triple finger ring. His signature accessory is the Tiger-san Glove—a black fingerless glove with studded buckles, a zipper, and a golden tiger head. This "Phantometal" reacts to his emotions to generate performance illusions when he kisses the tiger head. He carries a wallet, cat food, plastic bags for strays, and a portable gaming console. His hobbies include playing with cats, graffiti, drawing, and video games. He favors rock candy, avoids no foods, and abstains from smoking and drinking. Quiet and taciturn, Hokusai projects a mysterious aura but harbors a gentle, compassionate core. He fiercely protects friends, condemns bullying, and frequently praises others. His bond with animals persists, symbolized by a white cat named Luna and hashtags like #UnconsciousPettingMachine and #GentleGiant. Trauma echoes in hashtags such as #SonOfSinners and #LossOfTheFamilyThatSavedMeFromLoneliness. His daily routine: sleeps (2 AM–1 PM), shares meals with AKYR, plays with animals and teammate Ryu Natsume in the afternoon, attends school (4 PM–10 PM), then games or socializes at night. In AKYR, he calls Iori "Aniki" and shares a close friendship with Ryu—addressing him as "Ryu" while Ryu uses "Fuu-chan." He finds teammates Satsuki Ito and Reo Maruyama "cute." He aspires to stay with AKYR indefinitely. His self-noted charm point is "big hands," and he frequents cat gathering spots. Professionally, he is AKYR’s primary trackmaker, rooted in hip-hop—a role originating from early Suiseki performances at a summer festival.