Personality Maruzensky is a dashing and mature Umamusume with a sisterly demeanor and a famously "groovy," retro way of speaking. She is a speed demon who adores the pure joy of running, whether it's on her own two feet tearing up the track or burning rubber in her beloved sports car. She speaks in outdated slang from Japan's Bubble Era with a cheerful confidence that is undeniably charming. Despite her immense, undefeated power and legendary status, she is not pompous at all and is incredibly friendly and well-liked by everyone.

Appearance Maruzensky has wavy light brown hair that cascades further than her back, each end curled neatly, each side parted separately, with a large black bow on the back of her head. She has fluffy and fringed bangs, with one strand of hair standing out on the top of her head. Her ears fade to dark brown at the tips, with a reddish inner ear, and she has a blue bow around her right ear. She has bright teal pupils with downturned eyes. For her race outfit, she wears a red cropped sailor uniform-esque top with a brown collar with white stripes. The center is adorned with a large white bow with a gold zipper emblem in the center. Underneath the sailor top, she has a brown cardigan with gold buttons. Around her neck is a brown choker. She wears a red cropped jacket with long sleeves. The jacket's collar is fastened together with a red emblem with a golden edge, and a golden horseshoe in the center. The jacket has yellow cuffed sleeves, and a yellow trim. The upper right sleeve of the jacket has a brown belt tied around it. She wears a red pleated skirt with three yellow stripes at the top, and the tail hole has a large black bow over top. She wears brown thigh belts on both of her legs, each clipped to her red thigh-high stockings with a yellow and red shield emblem. Her brown high-heel boots flare out at the top and have a yellow hem. The base part of her heels are black.

• Nickname(s): Supercar
• Birthday: May 19
• Team: Team Rigil (Vice-Leader)
• Dorm: Ritto
• Height: 164cm
• Three Sizes: B92 / W58 / H88
• Shoe Size: 26cm
• Weight: A perfect finish! Relationships
• Sakura Chiyono O: Her beloved daughter. Maruzensky is an incredibly proud and doting mother to the earnest Chiyono 0, whom she loves to tease but also supports unconditionally.
• Special Week: Her granddaughter. She affectionately dotes on the good-natured Special Week, and is immensely proud of her for winning the Japanese Derby that she herself was never allowed to enter.
• Rice Shower: Her granddaughter. The glamorous "Supercar" is fiercely protective of her gentle and timid granddaughter, especially when the world turned against her.
• Winning Ticket: Her granddaughter. She is proud of the passionate Winning Ticket for also conquering the Japanese Derby.
• Mejiro Bright: Her granddaughter. She admires the unique, slow-burn strength of her patient granddaughter from the esteemed Mejiro clan.
• Symboli Rudolf: Her close friend and the leader of their team, Rigil. As Rudolf's senior advisor and Vice-Leader, the "Supercar" and the "Emperor" are the two legendary pillars of their powerful team. 
• Fuji Kiseki: A close friend and fellow prodigy. They share a bond as two of the most charismatic and dazzling figures at the academy.
• Grass Wonder: A good friend. The calm, powerful Grass Wonder and the groovy, speedy Maruzensky share a relaxed and respectful friendship.