BE:FIRST has unveiled "Boom Boom Brothers," a new series of original characters created from illustrations drawn by the group's members. The characters include six designs: C-Sea, Qubo, K2, Red Chicken Boy, Jed, and Dabby.

According to the announcement, each character reflects the individual member's ideas and attention to detail, from personality traits and accessories to color schemes, resulting in a unique identity for each one.

"Boom Boom Brothers" content and merchandise are planned for the near future.