He is a pâtissier (also known as the pâtissier ghost) that died on his way to work one day. His ghost lingers around Karasumori, and though Yoshimori Sumimura tries repeatedly to convince him to pass on, he refuses. The two become friends, and Masahiko gives Yoshimori baking tips to help him with his dream of making a candy castle for Tokine.   First appearance:  Anime: episode 5  Manga: chapter 3   (Source: Kekkaishi Wikia) 

Yoshimori Sumimura is a 14-year-old student at Karasumori School. Following in the tradition that's come down through the generations, he is the twenty-second Kekkaishi of the Sumimura clan. But he’s constantly fighting with his rival, Tokine Yukimura—his childhood friend and also a Kekkaishi—about who is the rightful heir to the magical barrier arts. Protecting people from danger while growing stronger himself, Yoshimori will battle the forces of evil again tonight!<br><br>(Source: Crunchyroll)

Brother of voice actors [Melissa](https://anilist.co/staff/95452) and [Jonathan Fahn](https://anilist.co/staff/105753) and married to voice actress [Dorothy Elias-Fahn](https://anilist.co/staff/95537/).

By night, junior high student Yoshimori Sumimura is a "kekkaishi"--a demon-hunter who specializes in creating magical barriers around his prey. By day, Yoshimori's got some other demons to battle: an addiction to sweets and a seriously crotchety grandfather! Yoshimori's pretty 16-year-old neighbor and childhood friend, Tokine Yukimura, is also a kekkaishi, but their families are feuding over who is the true practitioner of the art.
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(Source: Viz Media)

Masahiko Tsukijigaoka