Four Heavenly Dragons

The Four Dimension Dragons (４つののドラゴン Yotsu no Jigen no Doragon) are a series of Dragon-Type Monsters introduced in Yu-Gi-Oh! ARC-V. They are used by Yūya Sakaki and his dimensional counterparts.

Overview
These dragons are connected somehow to one another as they resonate when they are in close proximity with each other, whether they are summoned during a Duel or not. When facing off against each other, their owners suffer an intense burning pain in their chest and may enter a Awakened state, Dueling ferociously until their opponent is defeated  , although they are still capable of returning to their senses during the Duel. They can also cause their owners to sync with each other if they are in close proximity. Additionally, the dragons can influence their owners to summon them if the conditions for their summoning are met, be it on the field or in their hand.

The Dimensional Dragons seem to wish to fight each other and to do so they are capable of traveling through dimensions, as Yūgo stated that he was guided to both the Xyz Dimension's Heartland City and the Standard Dimension by "Clear Wing Synchro Dragon". When one of them is defeated, its owner appears to be absorbed into one of their Dimensional counterparts. In Yūto's case, despite having lost to Yūgo, he was absorbed by Yūya who was closer to his position. However, ownership of the dragons seem to be determined by the dragons themselves, as Yūto only consented to give Yūya "Dark Rebellion Xyz Dragon" after said dragon conveyed something to him.

When all four Dimension Dragons appear within close proximity at the same time, they will cause their masters to go awake, synchronize, and attempt to combine with each other. This also caused a phenomenon of dimensional hole appear in the sky. The four dimension dragons and its masters seems to be originally a single being as four dimensional counterparts states that they have been waiting for the moment they're "going to become one" as they try to reach the dimensional hole.

Each of the Dragons' names uses the following structure: "[Trait of the monster or the owner] + [Summon Mechanic Name] + Dragon". With the exception of the 2800 ATK "Starve Venom Fusion Dragon" they all have 2500 ATK and 2000 DEF (like most of the past protagonists' aces) and, in the anime, all of them have the common trait that their effects only affect Level 5 or higher monsters and are related to ATK. Their attack and effect names also follow similar patterns: the effect names are simply two English words, while their attack names follow the same pattern as previous Dragons, primarily the base "Eyes" Dragons; "[Japanese word] no [Two English words]."

Variations
Over the course of the series, Yūya and his dimensional counterparts receive newer forms of their Four Dimension Dragons by using them as Material for the three types of Extra Deck Summoning (Fusion, Synchro, and Xyz).