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Merlin Walford (マーリン＝ウォルフォード)Merlin Wolford is the adoptive grandfather of Shin. He is a renowned Hero who subjugated the first devil with Melinda.
He is a very lax person and constantly spoils Shin, teaching all of his knowledge to his grandson without a stop. He doesn't reprimand Shin unlike Melinda.
(Source: Kenja no Mago Wiki)