Senku has a physically weak and scrawny body. He has sharp red eyes, slim eyebrows, and a small nose. He has a long, spikey light green hair that fades to a darker green towards the ends. Senku is a confident, straightforward, and blunt individual. He's a highly logical and intelligent individual. He is apathetic to romance. He's a cold individual who tends to suppress his feelings towards others and pretends to not care. He likes to tease those close to him. He is an opportunist. He is 171cm.