____Fusion is when two of the characters decide to increase there power by merging with another character. And along with increasing there power they also get quite cocky. There are three kinds of fusion I am aware of, the namekian fusion, the normal fusion technique, and the potaru fusion.

____The namekian fusions were the first fusions to take place it has took place on namek with picallo and nail, as well as on earth with picallo and kamee. Obviusly it increases there power more than simply combining them or else picallo never would have been able to compete with freeza in his 3rd form. But the draw back of this type is that once they are fused they are stuck that way perminatley.

____This type of fusion can be done by all the charectors and is not perminent. However there are still limatations on fusing they must be aproxemetly the same size and have near the same power level. And also unlike the namekian fusion they can not just fuse they must perform a ritualistic like dance and if it is performed wrong then the fusion will be strange like they could end up fat or somthing like that and they will be weak. This form is learned by goku while training on king kai planet after he is killed by cell, but goten and chibi trunks are the first to sucessfully fuse.

____Finaly the potaru is a fusion that greatly amliphies there power but is also perminent. There is no stupid dance for this type all that the two people must do is each wear one of the potaru earings and maybe do somthing to activate it. Goku and Vegeta had to do this to beat boo but were not perminently fused becuase they were aitin by boo.