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.