Super Sonico (すーぱーそに子) is a fictional character created by Tsuji Santa of Nitroplus. Her debut appearance was on October 14, 2006 as the mascot for Nitroplus' annual live music festival event "Nitro Super Sonico", which took place at Shiba Park in Minato-KU.
Sonico appears in the various media as an eighteen year-old college student. She is depicted as an attractive young adult woman with large red 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, large bouncy breasts, thick thighs, and rather juicy, populous buttocks. She wears a camouflage hoodie, a cat shirt that exposes a hefty amount of cleavage, and a miniskirt that just barely covers her large, butt, leaving a generous helping of it exposed, even more so when she bends over, reaches upward, or rides a bike. Sonico is usually depicted in revealing outfits, in advertisement, such as string bikinis, thongs, or sexy cosplay. She also appears as a gravure idol as well as the vocalist and guitarist of the fictional band First Astronomical Velocity (第一宇宙速度 Daiichi Uchū Sokudo). 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 plays a heritage cherry red Gibson SG electric guitar with a batwing pickguard and black pickup covers named "Daydream." An older piece of official art incorrectly shows the guitar with a Gretsch logo on the headstock.