There's more than one artist under this tag.
1) FANATICS (Hangul: 파나틱스) is an upcoming South Korean girlgroup under FENT Entertainment. The girlgroup consists of Rensika, Doah, Chiayi, Yoonhye, SangAh, and Hyewon.
Their first sub-unit, FANATICS-FLAVOR (파나틱스-플레이버) - consisting of members Doah, Chiayi and Yoonhye - debuted on November 26, 2018 with the single album MILKSHAKE.
2) Fanatics (DK): Danish horrorpunk
3) Fanatics (USA): Spikey haired crusty street punk band from the Denver, CO.