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Freeform Fusion (勝手にフュージョン Katteni Fyūjon) is a type of fusion that appears in Dragon Ball Fusions. The results surpass even EX-Fusion in freedom of variety. There are over 50,000 possible combinations.


While referred to as a "fusion", Freeform Fusion more closely resembles the absorption ability used by Buu, as the instigator of Freeform Fusion will be the completely dominant fusee - retaining their name and personality once the fusion is complete, though with the addition of "KF" in front of their name. It also resembles Shinjin-based Potara fusion as well.

It also resembles Tekka's EX-Fusions which may explain why Tekka cannot perform Freeform Fusion as their EX-Fusion function similarly. Like EX-Fusion, Freeform Fusion requires the use of Metamo-Rings and Fusion Dance though Freeform Fusion is accessed through the Streetpass terminal and only one Freeform Fusion character can be present at any given time because they must defuse to create another Freeform Fusion. As it is based upon Streetpass Registration, the results can be random unless the player has another 3DS or 2DS system (only a single game card is required to register a fusee for Streetpass though two game cards allow the player to utilize Freeform Fusion without swapping the Game Card between systems which results in a time travel violation penalty from Jaco) or they Streetpass with someone who the player has had register a specific fusee.

The KF stands for Katteni Fusion, which translates as Arbitrary Fusion in the Japanese version of Dragon Ball Fusions. In the English localization, it is named Freeform Fusion, referencing its large number of variations and the freedom of fusion.