No. there is only 1 ghost.
Yes. When Harry holds the ressurection stone Sirius is one of the people he ressurects. Sirius isn't fully alive but he isn't a ghost either.
No.
No. Sirius black is a human.
Sirius B is already a white dwarf. The next transformation will be to become a black dwarf, but not for many many years.
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.)
Sirius is Harry's godfather. Sirius Black is Harry's godfather.Harry is sirius's Godson.
Sirius Black's motorbike was a 1959 Triumph Bonneville T-120.
Yes. Sirius Black is Harry Potter's godfather in the series.
Sirius Black was briefly mentioned in Harry Potter and the Sorcerer's Stone when Hagrid tells Dumbledore how he took Harry from Sirius and borrowed his flying motorcycle, but he does not become a prominent character in the series until the third book, Harry Potter and the Prisoner of Azkaban.
Sirius Black was in Azkaban for 12 years.
no