Four Dimensions

In the Yu-Gi-Oh! ARC-V anime, the universe is composed of four different dimensions, in which each inhabitant uses different Extra Deck Special Summon methods. They consist of the Fusion, Synchro, Xyz, and Standard Dimensions. According to Yuto, the Standard Dimension is in the center of the other three. While inhabitants of the Fusion, Synchro and Xyz Dimensions use Fusion, Synchro and Xyz Monsters respectively, the Standard Dimension initially did not have its own unique Special Summon mechanic, with the others being taught to students at Leo Institute of Dueling in Paradise City. Recently, however, an anomaly gave birth to a new Summoning mechanic, the Pendulum Summon.

Each dimension has its own dragon used by Yuya Sakaki and his counterparts that represent their respective dimension's trademark Summoning mechanic, as well as a bracelet worn by Zuzu Boyle and her counterparts that are visually evocative of them.

With the exception of Standard, alternate versions of past series characters also exist in these dimensions depending on the series that each dimension is based on.
 * Fusion: Yu-Gi-Oh! GX (Alexis Rhodes and Aster Phoenix)
 * Synchro: Yu-Gi-Oh! 5D's (Jack Atlas and Crow Hogan)
 * Xyz: Yu-Gi-Oh! ZEXAL (Kite Tenjo)

Inhabitants by dimension
The huge majority of characters in the anime are residents of the Standard Dimension, therefore their names are too numerous to list.