Onpu Segawa (瀬川おんぷ, Segawa Onpu) is one of the main characters and the fifth Ojamajo, initially starting off as an antagonistic apprentice beneath Majoruka. She began attending Misora Elementary School and quickly befriended Doremi, Hazuki, and Aiko with the intention of revealing her true goals to them. At the start of Sharp, Onpu officially joined the group as a tritagonist after revealing that she became a real friend of theirs after losing their Apprentice status. She joined them under Majorika when they were given the job of watching Hana.