BT21S is a part of the official 'BTS Universe', which is an animated series created by BTS, the South Korean KPop group. BT21S consists of 7 anthropomorphic characters that are inspired by the seven members of BTS. The characters are Tata, Chimmy, Cooky, Koya, RJ, Shooky, and Mang. They were designed by BTS and first unveiled in 2017. They appear in many of BTS’s albums and merchandise.