I think Patrick is my favourite.
I love the one where Spongebob and Patrick pretend to be Squidward. Spongebob does a good impression, and patrick just sings 'I'm squidward, I'm squidward'.
And when they go to the village full of SquidwarRAB, and Patrick goes up to a stranger.
"Are you Squidward?"
"no."
.
.
"Are you Squidward now?"