The grandfather of Yoshimori and the 21st head of the Sumimura family. He tends to be a very hot-headed fellow. In the Japanese version he is nicknamed &quot;Shige-jii.&quot; We know that Shigemori is a very skilled Kekkaishi; in one episode the powerful Masamori and him talk, Shigemori: &quot;You have become very powerful Masamori&quot;; Masamori: &quot;But I'm not even near your power&quot;.  Source - Wikipedia

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)

"He has recently left Viz Media due to low pay, and Kenpachi was subsequently recast."

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He provides the Japanese dubbed voice of Rick Sanchez from Rick and Morty and Dr. Heinz Doofenshmirtz from Phineas and Ferb.

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)

Shigemori Sumimura