J is a drone made by JC Jenson, specifically a Disassembly Drone model.
Instead of a normal face, the upper half of her face is a black screen visor that displays her eyes, and also other stuff, like emojis, symbols like anger symbols or blushing, or she can just show text on her visor, its all controlled by her. The second half, like most of her metal skin, is white, and contains her just her mouth. She has neon yellow eyes and silver hair in twin pigtails tied with black ribbons.