[Ghost of Harrenhal]

It's a close one between Dolorous Edd and the Blackfish. Edd's simple jokes are so incredibly funny and the stuff he says is so well written. And the Blackfish is just the Blackfish: too cool a knight not to be a favourite character.

I think makes the Blackfish my favourite was the picture of him peering out of some bushes. Can't find it now but maybe I'll try and link it when I do.