Technically no, but in the deathly hallows a form of him appears to Harry before his confrontation with Voldemort. Thanks to the resurrection stone.
no he's dead forever.
After the fifth one the only time he appears is in Deathly Hallows is as a memory.
No. R.A.B is Regulus Arcturus Black, Sirius' younger brother who is dead.
page 560.
No. Sirius black is a human.
Sirius black didn't come back after he died, except right before Harry goes into the forest to turn himself over to Voldemort. Harry puts on the ring with the resurrection stone in it on and turnes it three times, and there is his family standing there with him, as ghosts almost, but more closely resembling the people he saw come out of the wand in the 4th book during Priori Incantatem. Sirius, Lupin, Tonks, his mom and father come out of the ring to give him resolve. But no, sirius does not come back to life
They found out when the dog converted back into a human.
Although Dumbledore died in the Half-Blood Prince, he returns in the Deathly Hallows when after Voldemort kills Harry Potter, and comes to him, giving him a choice to "move on" or come back and fight.
Baby Got Back
Gary Oldman plays Sirius Black, otherwise known as Padfoot
No, Sirius Black is Sirius Black, Remus Lupin is someone else. (Actually they are close friends.)
In Harry Potter, once you have died you cannot be brought back to life. Sirius did reappear when Harry used the Resurrection Stone but only as a spirit who disappeared when Harry dropped the Stone.