Fusion class is another artificial stage that can be reached by humans or digimon by using the legendary spirits, digimon fusing with one or more other digimon, or a human fusing with a digimon.

Human fusion class are at the same class as an champion class in power. It is reached through the use of an legendary spirit.

Digimon fusion class of one or more other digimon with a digimon can vary in strength based on the classification of the digimon that are fused.

Hybrid fusion class is where a human and digimon fuse together to create a stronger digimon.