Loved by the three Gods since birth, he became immortal through their blessing and now travels alone (seeking a way to die). He has contracted with the Phantom Divine Beasts; while they do not travel by his side, he summons them using fragments of their souls as mediums. To end the divine blessing, all familiars under contract must be defeated.

A high-tier Phantom Divine Beast. A red dragon whose entire body is hidden within the clouds of the heavens; within those misty clouds, the person one misses most appears. He has a cautious personality and acts as the reliable eldest brother figure who follows Yugi's orders absolutely. Thunder Force: The original ultimate lightning-attribute skill. A beam of condensed electricity totaling hundreds of millions of volts. Lightning Blast: A lightning arrow imbued with electrical current. Upon impact, the target suffers a shock equivalent to being struck by lightning ten times in a row.

A high-tier Phantom Divine Beast. A giant who guards the boundary between the underworld and the living world. He is silent and stoic, serving as the emotional second brother figure. God Hand Impact: A fist that rends the earth. The original ultimate physical magic skill that tears the opponent in half.

A high-tier Phantom Divine Beast. An eternally burning golden phoenix characterized by a body made of pure gold. He has a talkative, lively, and pure personality, serving as the youngest brother figure. God Blaze Cannon: The original ultimate fire-attribute skill. Flames reaching hundreds of millions of degrees melt the opponent.

A Beast Tamer who was exiled from a Hero's party in the past, now traveling with his own familiars. As a Beast Tamer, he possesses taming abilities and skills to support his familiars.

A high-tier Cat Spirit. The first familiar Rein contracted with. It is said that the Cat Spirit race can only be handled by a select few and tamed only by the strongest Tamers. Upon contracting, she enhances the Tamer's physical abilities.

A high-tier Dragon (Red Dragon). Rein's second familiar. A dragon skilled in both physical combat and magic. It is rumored that Red Dragons are descendants of Osiris and thus possess superior magic compared to other dragon races, though this remains unconfirmed. Upon contracting, she enhances the Tamer's mana.

A high-tier Spirit. Rein's third familiar and Luna's quiet twin sister. Upon contracting, she grants the Tamer the ability of Multi-Casting.

A high-tier Spirit. Rein's fourth familiar and Sora's twin sister. Unlike Sora, she is talkative and has a bright personality. Upon contracting, she grants the Tamer immunity to status ailments.

A high-tier Creator God. The mother of the three Phantom Divine Beasts and Yugi's first familiar. She created the world and protects it with light that annihilates evil.