Mizumiya Su

AGE: 20 years old BIRTHDAY: 16 June HEIGHT: 145 cm (4'9") ZODIAC SIGN: Gemini EMOJI: 💬🔁💙

Mizumiya Su / 水宮枢. Her family name 水宮 uses kanji associated with “water” and “palace/shrine,” while 枢 means something like “pivot,” “hinge,” or “central point.” Secondary wiki notes also point out that although her name is romanized “Su,” the Japanese reading is effectively Suu / すう

She is a Japanese-speaking VTuber under hololive DEV_IS, as part of the five-member unit FLOW GLOW. FLOW GLOW consists of Isaki Riona, Koganei Niko, Mizumiya Su, Rindo Chihaya, and Kikirara Vivi. COVER describes FLOW GLOW as a VTuber musical artist group under hololive DEV_IS, with an early concept of members whose skills and mutual trust are still developing, but who recognize each other’s individual traits.

Su is officially described as FLOW GLOW’s publicity manager / 宣伝担当. Her official profile frames her as someone seeking love and praise, posting on social media while eating, and finding hope after meeting her groupmates. Her greeting/tagline is “Is your Su-charge at 100%?” / 「しゅぴしゅわー すうの充電たりてる？」

Su’s design is built around a cool light-blue, white, black, and pink cyber-pop palette. Her overall silhouette is small and energetic: oversized outerwear, chunky shoes, short bottoms, a bright shirt, dangling accessories, and a very distinctive ahoge. The official current height of 145 cm makes the “small but loud” visual identity even stronger, and secondary sources note that her originally listed 151 cm height was later changed to 145 cm after the ahoge was no longer counted.

Her hair is one of the most important parts of the design. It is pale icy blue with vivid pink streaks, styled with messy volume, short side layers, and twin braids in front. The front braids are tied with blue bows and pom-pom-like ends, giving her a playful mascot quality. The top of her hair forms a jagged lightning-shaped ahoge, matching the electric motif used across her logos, accessories, and phone design. Her eyes are large and bright blue, with a glossy idol-anime shine and small detailed highlights. VTuber Wiki describes her as having light blue hair, pink streaks, braids, blue bows, a lightning-like ahoge, and light blue eyes.

Her main outfit mixes streetwear, idol styling, and “cute gadget kid” energy. She wears a large white hooded jacket with black trim, oversized sleeves, strap details, and bold black graphics. The jacket has a loose, poncho-like drape that makes her body look even smaller inside it. Across the back are oversized laced black bands and a large lightning-bolt emblem, reinforcing the “charged-up” branding. The sleeves carry black graphic marks and ribbon-like shapes, while the hem uses striped black-and-white edging.

Under the jacket, she wears a bright aqua T-shirt with FLOW GLOW-style logo graphics on the chest. The shirt hangs loosely over short blue shorts, creating a layered street-casual look. Her legs are mostly bare except for black thigh strap details and bulky light-blue socks. The shoes are huge white sneakers with black laces and colorful rounded accents, giving her a heavy-footed, toy-like silhouette. She also has a pink phone case with lightning and logo motifs, a small crossbody strap, fluffy pom-pom charms, and a choker-like black band around her neck.

Her accessory language is very consistent: lightning, plush mascots, phone/social-media imagery, black graphic marks, and soft candy-like colors. Even her microphone design follows the theme, using a pale body, blue lacing, cloud-like charms, and small mascot heads near the top. She looks like a walking social-media sticker pack: bright, compact, chaotic, soft, and extremely brandable.

Officially, Su is a praise-seeking, affection-seeking, snack-loving publicity girl who posts online constantly. That profile already tells you a lot: she is not framed as a quiet technician behind the scenes, but as the member who keeps attention moving, talks to the outside world, and turns everyday self-presentation into her job. She wants to be noticed, loved, and complimented, and her “Su-charge” greeting makes attention itself part of her theme.

There is also a softer insecurity built into her official description. The line about wishing the world were kinder before meeting her friends gives her a surprisingly vulnerable underside for such a bright design. She is not just “cute and online”; she is someone who seems to have wanted reassurance from the world, found some of it in FLOW GLOW, and now turns that need for warmth into outward activity. The profile’s joke asking the gods to make her taller also establishes her height as a recurring self-conscious gag.

So, in simple terms, her official character core is: small, hungry, online, praise-motivated, socially expressive, slightly insecure, and trying to make the world feel friendlier through constant presence.

From secondary profile details, Su comes across as a performer with a mix of cute neediness, practical dexterity, idol ambition, and “PON” vulnerability. Her likes include dancing, cute things, light blue, eating, and shabu-shabu, while her dislikes include measuring height, insects, kanji, clams, and staying up all night. Those details fit the broad image: she is very visual and cute-oriented, food-motivated, attached to blue as her personal color, and easily embarrassed by the height topic.

Her goals also deepen the picture. Secondary sources list her dreams as becoming a daily source of enjoyment for everyone, doing a dance-focused live, and someday collaborating with Tuxedo Sam. That “daily meal” idea is especially fitting for her: she wants to be part of the audience’s routine, not just a distant idol. She wants to be consumed warmly and regularly, like comfort food or a daily treat.

Her strengths are not only “being cute.” Secondary sources list her special abilities as dancing and dexterity, and note that she showed needle-felting work and Minecraft FLOW GLOW skins during her debut stream. That suggests a hands-on, craft-capable side: she is not just an SNS mascot but someone with patience for small physical or creative tasks.

At the same time, she has a charmingly imperfect digital-native-but-not-PC-native contradiction. VTuber Wiki notes that she types slowly and said joining hololive was the first time she had to use a computer heavily, since she normally used her phone and had used iPads at school. That matches her “posts on SNS” characterization in a funny way: she feels very online, but more phone/social-app online than computer-power-user online.

Her relationship to height is one of her strongest recurring identity hooks. The official current profile says 145 cm, while secondary sources record that she was initially listed at 151 cm and later revised after her 3D debut, with the explanation that the previous measurement counted her ahoge. That is exactly the kind of detail that turns into a long-running chat joke: she is tiny, sensitive about it, and the lore itself bends around the gag.

Her content is generally categorized around free talk, gaming, and singing by Hololist, which fits her role as a socially present, audience-facing personality.

Musically, she is part of FLOW GLOW’s hip-hop/idol-influenced unit identity. COVER’s debut announcement says FLOW GLOW’s debut song FG ROADSTER was produced by Foux, with lyrics by pocyomkin of Gaki Ranger, and the group concept emphasizes each member’s rap style and ensemble energy.

Her music activity has continued beyond debut. The official talent page lists multiple FLOW GLOW releases such as FG ROADSTER, 24K GOLD, LOAD, good enough, stay by my side, MAKE IT, BREAK IT, and the album FLOW GLOW. VTuber Wiki also notes that she released her first original song, “Umya unya happy life / うみゃうにゃはっぴーらいふ,” around her birthday in June 2026.

Mizumiya Su is best understood as a tiny, hyper-branded, praise-hungry social-media idol with a softer emotional core. Visually, she is all electric-blue pop chaos: huge jacket, tiny frame, lightning motifs, mascot clutter, phone charms, oversized shoes, and a color scheme that makes her look like a living sticker. Personality-wise, she is built around wanting affection and reassurance, but not in a gloomy way. She converts that need into posting, performing, eating, joking, dancing, and trying to become part of fans’ everyday lives.

Her appeal is the contrast: she looks like a noisy cyber-pop mascot, but her official description hints at loneliness and a wish for a gentler world. She is small enough for height jokes, energetic enough for dance/idol work, clumsy enough for “PON” charm, and socially active enough to feel like FLOW GLOW’s promotional spark plug. In short, Su feels like the unit’s cute signal booster: a compact blue lightning bolt who wants attention, gives attention back, and tries to keep herself and her audience emotionally “charged.”