This fusion was originally to be for Goku and Gohan, but Gohan got zapped into Buu's body and Goku had to fuse with Vegeta.

 

Fights- Veggeto fought against Buu and defeated him easily, but Veggeto purposely got absorbed into Buu to save the other Z Warriors.

 

How to fuse- Each warrior puts one Portarra Earring. Then they fly into eachother and fuse.

 

Deaths- None

 

Time limit- Unlimited, that's why Vegeta was very hesitant to fuse. He hated Goku and always wanted to defeat him, and now he had to fuse with him? Permenantely? This was too much for Vegeta, but they had no choice. Luckily for Vegeta, they seperated in an attempt to save the Z Warriors inside of Buu's body

 

Kills- Would have killed Buu easily, but had to rescue the other Z Warriors.

 

 

 

This fusion was done by Goten and Chibi Trunks. After Goku stalled Buu and went Super Saiyan 3, he went to Kami's Lookout with them. He then taught them how to fuse for his precious last 30 minutes before he would return to the afterlife.

 

Fights- Against Buu, and did pretty well at it until Buu absorbed him.

 

How to fuse- In his last 30 minutes on Earth, Goku taught Goten and Trunks how to fuse at Kami's Lookout. He taught them the Fusion Dance. For the fusion you did a lot of movements with your bodies, say "Fusion-Ha," and then touch fingers together.

 

Deaths- None, but gets absorbed by Buu

 

Time limit- I'm not exactly sure, but I think it's something like 1 hour.

 

Kills- Almost killed Buu, but buu eventually absorbed him.

 

This fusion is not permenant and is also done by the fusion dance like Gotenks. This fusion is only shown in a movie against Janenba and in Dragonball GT against the Evil Shenlons.

 

Fights- After Pikkon was knocked out by Janenba, Goku and Vegeta perform the fusion dance and become Gogeta. Janenba is then easily defeated by him. i believe the first time Goku and Vegeta did the fusion dance to defeat Janenba, they did it incorrectly and became a very fat Gogeta. The second fight was against Li Shenron. They fused while they were in Super Saiyan 4 and became Super Gogeta. Unfortunately they split and were beaten up badly by Li Shenron. Then Goku finished him off with a Universal Wide Spirit Bomb.

 

How to fuse- Goku and Vegeta must perform the Fusion Dance.

 

Time limit- Same as Gotenks: 1 hour

 

Deaths- None

 

Kills- Almost killed Li Shenron, but then split up. Killed Janenba after he knocked out Pikkon.