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{{Infobox/Yu-Gi-Oh!/Charactercharacter | image name = Grandpa Demetto.jpg | image size = | english name en_name = Grandpa Demetto | japanese name ja_name = デメット爺さん | romaji name romaji_name = Demetto jīsan | alternate name = | manga debut manga_debut = {{chapter|Yu-Gi-Oh! ZEXAL|16|ref}} | appears manga appears_in_manga = ''[[Yu-Gi-Oh! ZEXAL (manga)|Yu-Gi-Oh! ZEXAL]]'' | gender = maleMale | occupation =

It is unclear exactly who or what Grandpa Demetto was, as his origin was never explained. When [[Cologne ]] [[Duel]]s [[Yuma Tsukumo (manga)|Yuma Tsukumo]], Grandpa Demetto appears as a part of her [[Field Spell Card|Field]] "[[Doll House]]", "fixing" Cologne's destroyed "[[Doll Monster]]s". She says that if Yuma "breaks" her dolls, Grandpa Demetto will fix them for her. When Yuma's friends make bad comments about Demetto's appearance, Cologne screams that Grandpa Demetto is always doing his best to fix the dolls, and that she won't allow them to treat him as a fool.<ref name="ch16">{{chapter|Yu-Gi-Oh! ZEXAL|16|ref}}</ref>

[[File:Demetto saves Koron.jpg|thumb|left|150px|Demetto saves Cologne-chan.]]After Cologne lost her Duel against Yuma, she was thrown to inside the Doll House which was in fire by the attack of Yuma's "[[Number]]". [[Cathy (manga)|Cathy]] tried to save her, but in her haste she mistakes one of Cologne's dolls for her instead. This time, Yuma decides to go save Cologne, but, who comes out of the Doll House carrying her in his arms is the one who gave Cologne a soul - Grandpa Demetto. Cologne's soul was supposed to leave her body, but Demetto gave her his own soul, which allowed her to keep alive. While he sends Cologne out of the fire towards Yuma, he is engulfed by the flames together with the field. Cologne mourns his death, saying that she loved him.<ref name="ch18">{{chapter|Yu-Gi-Oh! ZEXAL|18|ref}}</ref>

* Grandpa Demetto may be a reference to ''Gepetto'' based on the character "[[wikipedia:Gepletto|Geppetto]]" from the children's novel, ''[[wikipedia:The Adventures of Pinocchio|The Adventures of Pinocchio]]'' fairy-tale. In the novel, as he Geppetto is a kind kindly old craftsmanwoodcarver who created the wooden puppet [[wikipedia:Pinocchio|Pinocchio]], who created a doll is brought to life and gave it a lifeis treated as Geppetto's "son".