The demon king - but a baby. He’s the size of a toddler. He has red eyes and short black hair. His pupils are Kanji that read “王” which means “king” in Japanese. He has on black rags for clothes. He doesn’t know how to talk. He squeaks, cooes, whimpers and squeals. That’s how he shows his emotions because he’s not sure of how to talk. He’s afraid of demon slayers. Muzan ate his parents that abused him. He misses his dead aunt - Sariya. He is three inches tall and weighs six grams.