They are all great, but mine is definitely Herman. He is so funny with his kindness despite that big scary look! I love it how folks get scared of him.
I think my favorite character had to be the vampire-ish grandad.
I can see how you would like Herman, I think he was designed for us to be sympathetic with his character as he tried to be 'normal' when he obviously was not.
Lily is good, but she does not get to do much - at least that has always been by impression. It is almost like she is there for background, adding to the atmosphere, so to speak.