Yucudo Nike is the main protagonist of the Yu-Gi-Oh! Real Life Series, and is played by the creator of the series, Joshua Ratcliff. Edit
Yucudo was born and raised in Japan with his parents until he was 12, when they were killed in a tragic accident, and Yucudo was forced to move to the United States to live with his aunt, Amy, and uncle, Frank. Yucudo's father owned the corporation "Duel Monsters, Inc.," giving him access to a powerful set of cards, which he was returning to Duel Monsters, Inc., when he was interrupted by Zao Hikitama in the first episode. This deck was replaced with an Elemental Hero deck in Episode 2.
Yucudo has been shown to be mentored by Jace Katakura, which has involved Yucudo learning to use his new deck and controlling the injury inflicted on him by the Duel Disks. Jace seems to have also provided Yucudo with the majority of his cards after being taken under Jace's mentorship.
Yucudo has apparently attended Duel Academy, as he was given his old Slifer Red jacket by his childhood friend, Akira Hikari, though not much else is mentioned about this.