AtJap13 is a musical act of a dual personality created by vocalist and lyricist At Dye. At is of Japanese decent, and a great deal of the music shows this. At began singing in 2006 in a duo called At~Ic with a girl who went by the name of Yezi. At~Ic broke up after a few months and At went solo. At's music has changed a great deal over the years, beginning with an alternative rock/grunge/J-rock style to a cross between Japanese pop, American experimental, and British noise. More recently, At has taken a dive in to the Asian hiphop scene with songs like "Life Song" and "Tokkushikku Rabaa". Songs performed by At! and AtJap13 are in Japanese and English, as At speaks both. At created the act AtJap13 from an online persona that began on Youtube in 2009. The meaning behind this moniker is fluid, and can be taken many different ways. "It represents the three things I am. My name, my identity, and my number," At says. At has also said that it began as a satirical character of what a stereotypical Japanese-American teenager acts and looks like. At describes the genre of music performed by AtJap13 as Indie experimental street-style J-pop.
At's visual image is androgenous and has a few standard characteristics including copper hair, teased hair. blond wigs, platform sneakers, and white eyeliner. The musical act has two personalities. One side, At's real self (At Dye) is a darker, stronger look leaning toward punk, cybergoth, and rocker style. The other is At's alterego, AtJap13, with a cuter, more sensitive look typically following a yamanba and gyaru-oh style. Regardless of persona, At markets oneself as a genderless, nonconforming, rebellious twelve year old and nicknames self as "The Asian Ginger Kid" due to dyeing hair copper despite it being naturally black. At also tends to wear green contact lenses. When speaking in Japanese, At uses the boyish pronoun "boku" and Japanese fans use "-kun" after the name instead of "-chan".