Marco

Marco is a character in the Yu-Gi-Oh! ARC-V anime. He is a teacher of the Leo Duel School within the Fusion Course until he was turned into a card by Shun Kurosaki.

Standard Dimension Arc
Marco was mentioned during Yūya Sakaki's Duel against Reiji Akaba. During the Duel, Nakajima arrived to inform Himika Akaba of an unknown incident involving Marco that ultimately forced Reiji to leave the Duel inconclusive. Later on after the Duel, it was revealed that Marco had disappeared after being involved in a Duel against an Xyz Duelist, and the only things left of him were some of his cards and Duel Disk. His soul was later revealed to have been taken by Shun Kurosaki, sealed inside a card and delivered to LDS.

Fifth Dimension ARC-V Arc
After Zarc's defeat and the Standard Dimension being reborn into the "Pendulum Dimension", Marco was freed from his card. He is seen watching Yūya's Duel against Jack Atlas.