Alice Nine's musical style can mainly be described as rock, with touches of pop, and a few instances of dance music. Their works range diversely, including heavier songs that were more prevalent in their early career, slow ballads and medium tempo songs, and the lighter rock sound marked with more melodic instrumentation and synthesizers that is present on their 2007 album Alpha. As they progressed through the years, the band began releasing songs that focus more on appealing to the mainstream public. On their newest album, 9, Alice Nine utilizes more progressive metal elements.[citation needed]
The band's appearance shifted from a visual kei look to more normal clothing over the length of their career. In early work, Alice Nine's clothing in promotional footage and live concerts was a stylized take on traditional Japanese clothing, along with moderate makeup, piercings, and bright hair colors such as red and pale blonde. However, in 2006, the look began to fade out and essentially disappeared the year after, having been replaced with leather and the onset of street fashion, clothing that would appeal to popular culture. Music videos for "Blue Planet" and "Gekkou Yoku" show off a relaxed and casual look, while videos such as those for "Cosmic World" and "Rainbows" are examples of forays into street fashion.