As the eldest brother, V is most rational and calmest of his brothers, even more so than Vetrix at times. When he was younger, V was gentle and mature to others, looking out for his younger brothers and made sure they behave.    ~!After learning of his father's fate, V becomes cold and stoic. Assisting with Tron's revenge, V keeps his brothers in line and is usually shown with Tron conversing over important issues.  He is later revealed to be the son of Tron (Byron Arclight) and brother of III and V, with his real name being Christopher Arclight.!~  (Source: Yu-Gi-Oh! Wikia) 

The story takes place in the near future in a city called Heartland. Tsukumo Yuma is a young duelist who strives to become the Duel Monsters champion, despite being an amateur. One day, during a duel with a school bully, a mysterious spirit called Astral appears before Yuma, and helps him to win. Astral then explains to Yuma that he is searching for his lost memories, which have been transformed into 99 "Xyz Monster" cards called "Numbers" and have been scattered across the globe. The "Numbers" have the ability to possess the duelists who own them and bring out their darkest desires. In order to recover his memories, and collect the "Numbers" cards, Astral teams up with Yuma.

The continuation of Yu-Gi-Oh! Zexal. <br><br>
A new enemy has been revealed - Barian. They wish to gather the "Numbers" and destroy the Astral World to avoid their own world's destruction. As such, Yuma and his friends are their prime target, and the Barian begin to slowly enter Heartland City.