He turns into Kid Buu.
Goku and Vegeta take Majin Buu (the fat one) out of super buu
Super Buu Doesn't technically die, what happens is the Fat Majin Buu is taken out by Vegeta. Then majin gets shorter. He turns into kid buu. After that, things got worse. He destroys the Earth and Goku & Vegeta lure him to The Surpreme Kai's Planet. He dies by the way of Goku's Spirit Bomb. With the help of Hercule.....
Goku and Vegeta go inside him and take out Majin Buu (the fat one) and he turns into Kid Buu.
Yes; Goku and Vegeta end up in a (loosely speaking) friendship. This is apparent in the Buu/Majin Saga. Most refer to Goku and Vegeta as best friends.
They do a fusion towards the end of DBZ while fighting Majin Buu
Goku doesn't die after Majin buu. Simple as that.
Goku killed buu (buu in his final form as "kid buu") with the spirit bomb
they fuse in episode 253 of dbz thanks for the question
no
GOKU
He can still be alive because King (name) gave him a another chance because he had to help goku defeat Majin Buu
Vegeta becomes super sayian 2 when he doesn't kill Majin buu. When he came back to help goku defeat super buu.