Fusions

Fusion is just a cheap tactic to make weak gems stronger. Fusion is when two, sometimes three, people combine their powers and form a new being.

Fusions
Each member of the Boobo Joo Crew can fuse with each other. However, although they can fuse, the strongest member refuses to fuse with anyone, due to an accident taking place a long time ago.

Kat
Kirby - This is a fusion of Batty and Kat, combining Batty's shape-shifting and Kat's tendency to devour everything.

Denkat - This is a fusion of Dennis and Kat, it is literally the two just having hardcore sex, effective as it makes literally everyone turn away in disgust.

Nicokat - This is a fusion of Nick and Kat, combining both of their pervert tendencies making the ultimate pervert.

Kaui - This is a fusion of Maui and Kat, creating a powerful being, combining his demi-god power and Kat's unknown strength.

Batty
Although Batty refuses to fuse much like the strongest member, sometimes in dire circumstances he has to fuse.

Woody - This is a fusion of Batty and Dennis, combining Dennis's invisibility and Batty's ability to have a solution to every problem. Called Woody in homage to Woody in the first Toy Story.