When playing horror games, she starts off incredibly terrified, but as she gets used to it toward the end, she barely flinches and even teases the monsters while clearing the game. However, she does have a genuine vulnerability to horror; once, during a Slender Man penalty stream, she screamed and cried so hard she couldn't continue, eventually accidentally kicking her PC and shutting it down. The stream cut off, and she hasn't played Slender Man since. This tendency still surfaces during horror map penalties and 'Don't Scream' collaborations. She was severely bullied in middle school. Her bullies treated her gym clothes and stationery as their own. One day, they pretended to be her friends and extracted personal family secrets and weaknesses under the guise of listening to her worries, only to spread rumors and torment her the next day. Even her teacher stood by and watched once the bullying shifted from the teacher's previous target to her. When she asked for a consultation, the teacher suggested she transfer schools instead of trying to solve the problem. She eventually did transfer and had a peaceful time afterward. Since then, she has lived a vibrant youth with various romantic experiences. Every ex-boyfriend has left her with some kind of scar. Her viewers and even her real-life friends describe her dating stories as incredibly frustrating to listen to. She is steadily growing thanks to her unique, pleasant voice, great reactions, and charmingly peculiar broadcast atmosphere. After five years as a no-cam streamer, she transitioned to being a Virtual YouTuber. She grew up in a poor household where they had to use a communal bathroom and lived in a place with bugs.

She is characterized by her loud voice and high energy. She often lets out sudden shouts that make viewers' ears bleed or sings with a disastrously unique vocal style. Her intense emotional expressions when she's feeling wronged or excited are the main selling points of her stream. First-time viewers are often shocked or in pain, but long-time fans who have adapted react coolly, saying things like "that's a bit mild." Of course, even they don't seem to guarantee their survival when the decibels exceed the threshold.

Her gaming skills are generally quite good. She has excellent physical mechanics, which she considers one of her greatest strengths. Gaming is the primary content that takes up the largest portion of her broadcasts. Her main character outfit consists of a white camisole, a navy miniskirt, a translucent jacket, and mismatched loose socks. As suggested by her hair color and attire, white and light purple are the dominant colors, accented by numerous diverse accessories. Notable styling points include a red ribbon tied in her side hair, a Mamison mask badge and a Doong-gri keychain on both lapels of her jacket, a bandage on her left leg, and chokers on her right leg and neck. While she is fully dressed, the short camisole and skirt give her a high-exposure look. Physical traits that require a closer look include dragon scales on her left leg and a mole on her right hip. Her signature items are horns, a tail, and a ribbon, while her point colors are light purple, mint green, deep navy, rose pink, and lavender white.

She has an incredibly weak constitution, even among streamers. It's to the point where she gets donations saying, "Why do I watch Seolbaek? It's simple: 'Cuteness.'" Her actual gaming skills aren't very good. Since gaming is her main content, she genuinely enjoys it; she once mentioned that even if she dates in the future, it would be hard to meet someone who doesn't play League of Legends, fearing they would have no common interests. She primarily communicates with viewers through Just Chatting in a soft, comfortable voice or plays various games with fellow streamers. She occasionally films V-LOGs but never reveals her face or uses a mask-cam. She has short white hair, purple eyes, cat whisker markings on her cheeks, and a beauty mark under her right eye. She has two main outfits. Her default is a combination of white and gray checkered patterns with a black choker featuring a snowflake point. Her new outfit, added in the summer of 2023, is a white sleeveless dress with a purple cardigan. Both outfits feature black X-shaped and straight hairpins on the left side of her bangs. Recently, the latter outfit has been used more frequently in YouTube thumbnails than the default one.