kradness is a Japanese singer and creator known for his high-pitched tenor voice and his origins in the vocaloid cover community on Nico Nico Douga. Born on December 1, 1993, he began uploading songs under the name kradness in 2011, a moniker derived from reversing the word dark to signify turning darkness into brightness with his music. He is recognized as an utaite, a category of singer who primarily performs covers of vocaloid songs, and he is also noted for producing his own audio mixing and video editing.

Kradness possesses a clear and powerful high range, which has become his signature vocal trait. His voice is often processed with autotune, a technique his fans refer to as kerorist, and it allows him to sing in ranges typically associated with female vocalists. His musical style is primarily rooted in electronic, rock, and dance music, and he frequently performs fast-paced, energetic songs.

Kradness has been credited for several anime theme songs. His first anime tie-up was the opening theme for the television anime Nil Admirari no Tenbin, performing the song Tandeki Mirage-ism. This single was released on June 6, 2018, and its coupling track, Joranbuen, was performed by his unit Quarks, formed with DJ and composer Camellia. He is also credited for performing the ending theme N.U.L.L. for the anime Fight League: Gear Gadget Generators, which was released in February 2019.

Throughout his career, kradness has engaged in numerous recurring collaborations. He has frequently worked with the singer Reol, with whom he has performed popular songs such as Okochama Sensou and Remote Control. These duets are among his most popular works. Other frequent collaborators include the singers un:c and Leychal, as well as producers like Camellia, niki, and Giga. In addition to his solo work and duets, he has been a member of the collaboration unit Riot of Color and formed the electronic unit Quarks with Camellia, which released the mini-album Dualive in April 2016.

His commercial discography includes several major-label albums. He released his first full-length album, KRAD VORTEX, on December 4, 2013, under the Victor label. The album features popular vocaloid covers such as WAVE, Senbonzakura, and Leia, as well as his collaborative tracks with Reol. He subsequently released the albums KRAD MATRiX and KRAD PARADOX, continuing to showcase his high-energy interpretations of vocaloid and electronic music. Kradness is regarded as a significant figure in the utaite community, known for his technical skill in mixing and his distinctive, powerful voice that has helped popularize vocaloid music covers to a wider audience.