Who are the main characters in Neil Gaiman's novel for young readers titled The Graveyard Book?

The main characters in The Graveyard
Book, Neil Gaiman’s novel for young readers, include the following persons
(and/or
creatures):

• Jack, a
  mysterious figure who murders the parents and sister of the main character while
  intending to murder the main character
  himself.


• Nobody (“Bod”)
  Owens, the main character, who as an infant escaped being murdered by
  Jack because he had wandered off to a nearby graveyard as the murders were taking
  place.


• Mr. and Mrs. Owens,
  dead residents of the graveyard who adopt Jack at the urging of Jack’s recently murdered
  parents.


• Scarlett Amber
  Perkins, a young (living) girl who befriends young Bod when she is
  playing in the graveyard. She leaves his life temporarily but eventually plays an
  important part in its later
  developments.


• Silas, a dead
  resident of the graveyard who has special powers and who becomes a mentor and protector
  of Bod.


• The Sleer, a
  snake-like creature who guards old treasure and who ultimately disposes of
  Jack.


• Miss Lupescu, another
  mentor and protector who teaches Bod a highly useful skill that will later help him
  survive. In a different form, she also helps him much more practically in a time of
  great need.


• Liza Hempstock,
  a dead witch whom Bod tries to help, thereby creating dangerous trouble for himself.
  


• Abanazer Bolger, an
  unscrupulous character whom Bod meets while trying to help
  Liza.


• Mr. Frost, a man who
  at first seems helpful but who later turns out to be the original killer, Jack. When
  Frost is ultimately disposed of by the Sleer, the event is described as
  follows:

readability="12">

He was shouting wildly, desperately, shouting at
Bod to call the thing off, to save him, please, please . . . and then the man’s face was
pulled through the wall, and the voice was
silenced.

Eventually Bod
leaves the graveyard, says good-bye to his dead adoptive mother (Mrs. Owens), and sets
out on the journey into the rest of his life.

Gaiman's
novel employs characters who resemble time-honored archetypes (the young hero, the evil
villain, the good friend, the loving mother, the frightening monster, the appealing
heroine), and the book ends as many works involving "the hero's journey" often do: with
yet another journey.