Circuit Board is a green printed circuit board (PCB) that has a code next to her mouth and has a neck connected with (black, yellow and red) wires. She has a small microchip on her body and various green traces, as well as on her head and 'hair'. She has black eyes, mouth, and limbs. Underneath her eyes, she has moon-shaped lines as glasses.
Circuit Board is shown briefly in her debut, but it is seen she is supposedly the leader of both her followers Plug and Microchip.
- Leadership: She has lead Plug and Microchip to hide in a room with her leadership.
- Circuit Board is yet to have a speaking role.