Kamado Sumihiko in Kanji
鎌田澄彦
鎌 (Kama) - a type of sickle or scythe
戸 (Do) - door, barrier, household
納 (No) - deliver, supply, accept
澄 (Sumi) - clear, make clear, clarify
彦 (Hiko) - boy, prince
Therefore, the name "Kamado Sumihiko" can be written in kanji as 鎌戸納澄彦.