Sonico appears in the various media as an eighteen year-old college student. She is depicted as an attractive, busty and voluptuous young adult woman with large brown eyes and straight light pink hair. She keeps her hair long in back and in the front it covers her forehead, around her eyes, down to the bridge of her nose. She is always shown wearing her signature headphones on her head. Her depictions show much variation in her facial features and body proportions between the different artists, while always keeping her trademark traits; headphones, pink hair color and large bust. She also appears as a gravure idol as well as the vocalist and guitarist of the fictional band First Astronomical Velocity. She is prone to sleep in a lot, often requiring help to wake up, and her favorite foods are macarons. Her bandmates refer to her as "Nico".
- Sonico isn't really an otaku, but she has cosplayed a lot thanks to her gravure model job. Some of the costumes include; Black★Rock Shooter, Kirino Kousaka, Kurisu Makise, Madoka Kaname and Miku Hatsune. For video game related cosplay, she enjoys playing videogames in her free time. One of her possible costumes in Communication With Sonico is as the Master Chief. Some other videogame related cosplays she has sported are; Riela Marcellis, Merurulince Rede Arls, Totooria Helmold, Noel Vermillion, Fuka Kazamatsuri, and a Gears of War costume.