Silas

Bod's guardian and teacher

brings him food, clothes and gives advices

has the Freedom of the Graveyard

can come and leave whenever he wants

quiet, smart, gloomy and protective towards Bod

fights against the Jacks of All Trades with Miss Lupescu (werewolf) and the others

a vampire?

because he sleeps at day and lives at night, he sleeps in the coffin, he's neither alive nor dead, has pale skin and has lived long time already