Grandpa Demetto

Grandpa Demetto is a character appearing in the Yu-Gi-Oh! ZEXAL manga. Few is known about him.

Biography
Grandpa Demetto was the one who granted Koron-chan a soul, by Dr. Faker's request, giving her "humanity".

After Koron-chan loses her Duel against Yuma Tsukumo, she is thrown to the fire which surrounded the field by the attack of Yuma's "Number". Cathy tries to save her, but in the hurry, she mistakes and brings one of Koron's doll out of the fire instead. This time, Yuma goes to save her, but he couldn't get out. When both were going to be burnt, Grandpa Demetto appears, and leads them out of the fire, being himself engulfed by the flames, together with the field. Koron mourns his death, saying that she loved him.