Freeform Fusion

Despite being called a "fusion," Freeform Fusion more closely resembles absorption. The initiating fighter remains fully dominant, keeping their identity, name, and personality while incorporating the secondary fusee's power and some visual traits. The resulting character gains the "KF" prefix in Japanese (standing for Katteni Fusion, meaning "Arbitrary Fusion"), which was localized as "Freeform Fusion" in the English version to emphasize the method's enormous flexibility.

Like EX-Fusion, Freeform Fusion requires Metamo-Rings and a Fusion Dance to activate. However, it is accessed through the Streetpass terminal in Dragon Ball Fusions rather than the standard fusion menu. The secondary fusee is registered through the handheld system's local communication features, and the results can be somewhat random unless the player carefully controls which character data is exchanged.

What makes Freeform Fusion visually distinctive is how it blends transformations. A KF Goku combining Super Saiyan God with Vegeta's Super Saiyan Blue form produces a hybrid appearance mixing the red and blue divine states. Goku Black fused with various characters in Super Saiyan Rose creates eerie combinations layering the pink-and-black divine aura over other characters' features. These hybrid visual designs allowed Dragon Ball Fusions to explore "what if" scenarios that no other media in the franchise has attempted.