Z-Unions are special groups related to a specific character. By going to the Z-Union shop located on the upper left portion of the lobby, talking to the clerk will allow the player to join, leave, or check rankings in their Z-Union. Every playable character has a Z-Union. After joining, a small orange circle with a graphic of a pair of hands shaking at the bottom, and the respective union's character in the center, will appear on the member's player card. Upon being prompted for a match, it is one of the pieces of information given to a player about their opponent before they accept a match. If a player is not in a Z-Union, they are labeled as 'Independent'.
Z-Unions compete in the FighterZ Cup. Depending on how well a specific union does, the unions are ranked from first to last place. Rewards (usually a large sum of Zeni) are given for being in a Z-Union after a FighterZ Cup concludes. They include rewards based on the player's union's rank, and how much the player contributed to their union during the FighterZ Cup.